[Bug]: Space character in column name of conditions file yields UnboundLocalError in Builder

[hoechenberger]

PsychoPy Version

v2024.1.4

What OS are your PsychoPy running on?

macOS Silicon

Bug Description

Adding a loop with a conditions CSV file that has a space in at least of the column names yields, immediately after selecting the file:

Traceback (most recent call last):
  File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/builder/dialogs/__init__.py”, line 1681, in onBrowseTrialsFile
  File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/builder/dialogs/__init__.py”, line 1715, in updateSummary
  File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/data/utils.py”, line 499, in importConditions
UnboundLocalError: local variable ‘trialList’ referenced before assignment

Expected Behaviour

PsychoPy should parse the conditions file

Steps to Reproduce

1. Create a CSV file with e.g. the following content:

   Col1,Col 2
   Foo,Bar
   

2. In Builder, Insert Loop and select the CSV file for Condition

Additional context

Removing the space (Col 2 -> Col2) works around the problem.

Has been reported on the forum before:
https://discourse.psychopy.org/t/unboundlocalerror-local-variable-triallist-referenced-before-assignment/13472