poll.py -> check if timer is registered before attempting to deregister

uki-dev / blendquery

CadQuery and Build123d integration for Blender

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poll.py -> check if timer is registered before attempting to deregister #3

Closed jdegenstein closed 6 months ago

jdegenstein commented 6 months ago

Currently I am getting some errors when using blendquery because occasionally the timer is not registered before dispose() tries to deregister. This PR adds a check that it is registered before attempting.