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fix: Guard against None in generate_avatar_letter and pipeline fix

Saksham Kaushal requested to merge saksham-personal/gajim:fix-avatar-none-guard-pipeline into master

This merge request adds a None‐guard in generate_avatar_letter() to prevent Gajim from crashing when it tries to generate an avatar for a MUC or contact that has no name set.

When joining a room or discovering a service with no display name, Gajim would call: generate_avatar_letter(text.lstrip(), 1).upper() with text == None, leading to: AttributeError: 'NoneType' object has no attribute 'lstrip' (full back‑trace in Error Details below).

Error Details :

Traceback (most recent call last):
  File ".../gajim/gtk/avatar.py", line 62, in generate_avatar_letter
    return get_first_graphemes(text.lstrip(), 1).upper()
AttributeError: 'NoneType' object has no attribute 'lstrip'

NOTE - This is a backwards‑compatible bugfix; existing avatars (when text is non‑empty) are unchanged.

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