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The change in error handling makes this a bit harder to review, but it otherwise looks OK if this is the intended behavior. I am not sure that it is.
The original version:
 1. If __qualname__ was present in the original dictionary,
 then it was deleted.
 2. If __qualname__ was present in the original dictionary,
 then the qualname slot in the new type was left unitialized.
Why (1) was done I don't know. (2) is obviously a bug.
The patched version:
 1. Sets the slot qualname to the __qualname__ from the original
 dictionary (if present).
 2. Copies the __qualname__ attribute from the original dictionary
 to the new dictionary (if present).
 3. Leaves the original dictionary alone.
The deletion and unitiliazed slot problems are gone, but I am not sure if (2) is needed. Just fixing (1) and (3) seems more reasonable to me.