Skip None text when binding wildcard list elements

[tefra]

📒 Description

Mixed content and other list wildcards got a stray None at the start of the list when the element had no text (or only whitespace) before its first child but did have a tail.

Resolves #1130

🔗 What I've Done

ElementNode.bind_wild_text normalizes the text first. The early return only covered the case where both text and tail were None, so the list branch inserted None whenever the tail alone was set. The list branch never uses the tail, because the parent node already appends it. The list branch now returns early when the text is None.

Example from the voko abak.xml sample, <fnt>\n <bib>RugxDom</bib> ...:

# before
Fnt(content=[None, Bib(value='RugxDom'), Lok(...)])
# after
Fnt(content=[Bib(value='RugxDom'), Lok(...)])

💬 Comments

Serialized XML doesn't change, because the serializer already skipped None entries. Only code that reads the parsed content lists sees the difference.

• W3C, --mode xsd --save-output: the only output change caused by this fix is the pycode dump all306.v01.py, where B(content=[None]) becomes B().
• Samples: no output changes. Voko needs Enable entity resolution in the voko tests xsdata-samples#91, which enables resolve_entities now that XXE in LxmlEventHandler.parse() #1228 turns it off by default.

🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.97%. Comparing base (cd7a341) to head (fb06435).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1237   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files         117      117           
  Lines        9412     9414    +2     
  Branches     1446     1447    +1     
=======================================
+ Hits         9410     9412    +2     
  Misses          1        1           
  Partials        1        1           

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