Biblatex: Formatting @online and @incollection bibliographic entry types

Question

I'm trying to format two Biblatex entry types.

For the @incollection entry I want to get rid of the first comma (marked in yellow) and change the second comma to a period.

For the @online entry I can't seem to get rid of the date. Even if there is no date field in the entry, the brackets still show up but empty. I also want to change the comma after the title 'Polymer' to a period. Is there a way to suppress the 'Adresse:' (german for 'url:') string?

MWE:

\documentclass[11pt, oneside, a4paper, bibliography=totoc, parskip=half, 
   BCOR=12mm, captions=tableheading, openany, numbers=noenddot, headinclude, 
   liststotoc]{scrbook}
\usepackage[german]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{filecontents}
\begin{filecontents}{bibliography.bib}
@online{polymer2020,
    title = {Polymer},
    author = {{N. N.}},
    journaltitle = {Wikipedia},
    url = {https://de.wikipedia.org/wiki/Polymer},
    urldate = {2020-02-16}
}
@incollection{hans2020,
    title = {Ein {{Qualit\"atsicherungskonzept}}},
    booktitle = {Additive {{Fertigung}} von {{Bauteilen}}},
    author = {Hans, Peter and Werner, Meier},
    editor = {Michael, Hauser},
    date = {2020},
    publisher = {{Springer}},
    location = {{Berlin}}
}
\end{filecontents}

\usepackage[backend=biber, style=ieee, citestyle=numeric, sorting=nyt, 
   autocite=inline, isbn=false, dashed=false, url=false]{biblatex}
\DeclareNameAlias{sortname}{family-given}
\DeclareNameAlias{default}{family-given}
\DeclareFieldFormat[book,inbook,incollection,inproceedings]{series}{#1}
\DeclareFieldFormat{editortype}{\mkbibparens{#1}}
\DeclareFieldFormat*[online]{title}{\textit{#1}}
\renewcommand{\labelnamepunct}{\addcolon\space}
\renewcommand{\mkbibnamefamily}[1]{\textsc{#1}}
\renewcommand{\multinamedelim}{\addsemicolon\space}
\renewcommand{\finalnamedelim}{\addsemicolon\space}

\addbibresource{bibliography.bib}

\begin{document}
    \cite{polymer2020}
    \cite{hans2020}
    \printbibliography
\end{document}

Answer 1

For the first comma in the @incollection you need to redefine editortypedelim (see for example Remove comma after editor name in biblatex and biblatex: How to remove the comma before ed./eds.?).

The period is a bit tricker and in the example there are several ways to produce a period in that position, but the effects may vary if there are more fields in the entry. Here I decided to go via the bibmacro publisher+location+date.

The parentheses around the missing date can only be removed by patching the driver (cf. also Remove parentheses for empty year field biblatex ieee style, though the solution presented here is slightly more elegant).

Again the period in the @online entry can be produced in several ways. Since we are patching the driver already, I decided to patch it in such a way to insert the period directly before the URL. Again the result can vary if more fields are present.

\documentclass[11pt, oneside, a4paper, bibliography=totoc, parskip=half, BCOR=12mm, captions=tableheading, openany, numbers=noenddot, headinclude, liststotoc]{scrbook}
\usepackage[german]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage[backend=biber, style=ieee, citestyle=numeric, sorting=nyt,
  autocite=inline, isbn=false, dashed=false, url=false]{biblatex}


\DeclareNameAlias{sortname}{family-given}
\DeclareNameAlias{default}{family-given}

\renewcommand{\mkbibnamefamily}[1]{\textsc{#1}}

\DeclareDelimFormat{multinamedelim}{\addsemicolon\space}
\DeclareDelimAlias{finalnamedelim}{multinamedelim}

\DeclareFieldFormat{editortype}{\mkbibparens{#1}}
\DeclareDelimFormat{editortypedelim}{\addspace}

\DeclareDelimFormat[bib]{nametitlepunct}{\addcolon\space}

\DeclareFieldFormat*[online]{title}{\textit{#1}}

\DeclareFieldFormat[book,inbook,incollection,inproceedings]{series}{#1}

\renewbibmacro*{publisher+location+date}{%
  \printunit{\addperiod\space}%
  \printlist{location}%
  \iflistundef{publisher}
    {\setunit*{\addcomma\space}}
    {\setunit*{\addcolon\space}}%
  \printlist{publisher}%
  \setunit*{\addcomma\space}%
  \usebibmacro{date}%
  \newunit}

\DeclareFieldFormat[online]{date}{\mkbibparens{#1}}
\usepackage{xpatch}
\xpatchbibdriver{online}
  {\printtext[parens]{\usebibmacro{date}}}
  {\usebibmacro{date}}
  {}{}

\xpatchbibdriver{online}
  {\newunit\newblock
   \usebibmacro{url+urldate}}
  {\setunit{\addperiod\space}\newblock
   \usebibmacro{url+urldate}}
  {}{}

\DeclareFieldFormat{url}{\url{#1}}

\begin{filecontents}{\jobname.bib}
@online{polymer2020,
  title        = {Polymer},
  author       = {{N. N.}},
  journaltitle = {Wikipedia},
  url          = {https://de.wikipedia.org/wiki/Polymer},
  urldate      = {2020-02-16},
}
@incollection{hans2020,
  title     = {Ein Qualitätsicherungskonzept},
  booktitle = {Additive Fertigung von Bauteilen},
  author    = {Hans, Peter and Werner, Meier},
  editor    = {Michael, Hauser},
  date      = {2020},
  publisher = {Springer},
  location  = {Berlin},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
    \cite{polymer2020}
    \cite{hans2020}
    \printbibliography
\end{document}