Non-evaluated Plot Chunks Issues

[brandonwillard]

I'm using the code from ee902f3, compiling/weaving with Pweave -f texminted -c -d ....
If I have a chunk with settings like

<< not_evaled_plot, fig=True, caption='A plot caption', f_pos='h!', evaluate=False >>=
...

then the output tex will look like

\begin{minted}[mathescape, fontsize=\small, xleftmargin=0.5em]{%s}
...

which implies that a value isn't being substituted ("python" perhaps?) and the TeX won't compile.