#23761: Mysql validator crashes with None db_type return. - Backport of master 
fix
to 1.7
-------------------------------+---------------------------
     Reporter:  adepue         |      Owner:  nobody
         Type:  Bug            |     Status:  new
    Component:  Uncategorized  |    Version:  1.7
     Severity:  Normal         |   Keywords:  mysql db_type
 Triage Stage:  Unreviewed     |  Has patch:  1
Easy pickings:  0              |      UI/UX:  0
-------------------------------+---------------------------
 A fix was made in August in master:
 
https://github.com/django/django/commit/e9103402c0fa873aea58a6a11dba510cd308cb84#diff-14

 The fix contains a lot more than is needed for this specific issue,
 however the specific changes to django/db/backends/mysql/validation.py
 would be great to have in Django 1.7

 The issue is that if you create a custom field that returns None for
 db_type(), then it causes crashes due to dereference None to check the
 startswith().

 This worked fine in < Django 1.7 and works fine in upstream.

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Ticket URL: <https://code.djangoproject.com/ticket/23761>
Django <https://code.djangoproject.com/>
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