Initialize thread local value on each thread

[jonson]

Attributes on the thread local metadata variable were being initialized at import time by the calling thread. All access from other threads were result in errors like AttributeError: '_thread._local' object has no attribute 'minperiods''.

This change make the initialization lazy via a property and binds to the calling thread.

[Haakam21]

I am getting the following error when calling indicators from a thread:

Unhandled Error Traceback (most recent call last): ... File "/Users/haakamaujla/Library/Python/3.8/lib/python/site-packages/pandas/core/indexers.py", line 171, in check_setitem_lengths raise ValueError( builtins.ValueError: cannot set using a slice indexer with a different length than the value

[luke82]

I test it just now and for me worked like charm too! THX

[luizgomesdev]

Thanks man! U are awesome.