TikZ: Removing the inner line of circle split, rectangle split, etc.

Question

How do you remove the line of the split within a split shape (like circle split or rectangle split). For example:

\begin{tikzpicture}
\node[draw, circle split, thick]{$1$ \nodepart{lower} $2$};
\end{tikzpicture}

gives you a thick circle with a thick splitting line. Can the middle line be removed?

Answer 1

This answer was given to me by Mark Wibrow (thank you Mark!). I'm quoting it here for future reference:

If you just want to eliminate the split line then try using the rectangle split draw splits key:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.multipart}
\begin{document}
\begin{tikzpicture}[every node/.style={draw, anchor=text, rectangle split,rectangle split parts=3}]
\node {text \nodepart{second} \nodepart{third}third};
\node [rectangle split ignore empty parts] at (2,0)
{text \nodepart{second} \nodepart{third}third};
\end{tikzpicture}

\begin{tikzpicture}[every node/.style={draw, anchor=text, rectangle split,rectangle split parts=3, rectangle split draw splits=false}]
\node {text \nodepart{second} \nodepart{third}third};
\node [rectangle split ignore empty parts] at (2,0)
{text \nodepart{second} \nodepart{third}third};
\end{tikzpicture}

\end{document}