Loop over all possibilities and test if one of them is disabled

[typemytype]

@typesupply please test before merging...

import defcon 

f = defcon.Font()

names = ["A"]

f.dispatcher.holdNotifications()
for name in names:
    f.newGlyph(name) 

f.dispatcher.releaseHeldNotifications()

this script throws an error: defcon/objects/layer.py", line 707, in _glyphNameChange KeyError: None

• `layer.newGlyph* disables all notifications
• when looping over all held notifications the disabled one is still there...

--> first loop over all possible combinations and test it against the disabled notifications, if found just return, otherwise look to store them in the held notifications

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.47%. Comparing base (923bd19) to head (3dbcd4c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #462   +/-   ##
=======================================
  Coverage   87.47%   87.47%           
=======================================
  Files          57       57           
  Lines       10365    10366    +1     
  Branches     1337     1338    +1     
=======================================
+ Hits         9067     9068    +1     
  Misses        921      921           
  Partials      377      377           

Flag	Coverage Δ
unittests	87.47% <100.00%> (+<0.01%)	⬆️

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[typesupply]

This looks good to me.