Minor fix to check on text.latex.preamble.

anntzer · anntzer · commit 0086ed09011b · 2017-06-03T19:38:59.000-07:00
Don't warn via the verbose system when text.latex.preamble is an empty
list (rather than a list containing an empty string).  Run the
simple_plot.py example with the --verbose-helpful flag to see the
difference.
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -1115,7 +1115,7 @@ def rc_params_from_file(fname, fail_on_error=False, use_default_template=True):
     if config['datapath'] is None:
         config['datapath'] = get_data_path()
 
-    if not config['text.latex.preamble'] == ['']:
+    if "".join(config['text.latex.preamble']):
         verbose.report("""
 *****************************************************************
 You have the following UNSUPPORTED LaTeX preamble customizations:
