Fix AttributeError when 'main page title url opens in other window' is boolean

[jacobyoby]

Summary

Fixes #980

When main page title url opens in other window is set to a YAML boolean (False or True) in the configuration, docassemble crashes with:

AttributeError: 'bool' object has no attribute 'strip'

The workaround was to quote the value as a string ("False"), but booleans should work since YAML naturally parses unquoted False/True as booleans.

Root cause

In docassemble_base/docassemble/base/parse.py, the default_title initialization loop processes main page * config values and calls .strip() directly on the value without converting to string first:

# Before (line 8450-8451):
if parts.get('main page ' + title_name, '') != '':
    self.default_title[lang][title_abb] = parts['main page ' + title_name].strip()

False != '' evaluates to True, so the code enters the block and calls False.strip() → crash.

Fix

Wrap with str() before .strip(), matching the pattern already used on lines 8441 and 8443 in the same loop for metadata values:

# After:
if str(parts.get('main page ' + title_name, '')).strip() != '':
    self.default_title[lang][title_abb] = str(parts['main page ' + title_name]).strip()

The downstream consumer in helpers.py:1207 already compares via str(status.title_url_opens_in_other_window) == 'False', so the string representation flows through correctly.

Verified behavior

Input	Result
False (bool)	"False" → title opens in same window ✓
True (bool)	"True" → title opens in new window ✓
"False" (string, existing workaround)	"False" → same window ✓
"" (empty string)	Skipped (no default set) ✓
Missing key	Skipped ✓