* Fix statistics for binary sensor
-) Binary sensors have 'on' and 'off' for state resulting in issue as numbers were expected. Fixed so that it works with non-numeric states as well.
-) Added check to skip unknown states.
-) Updates test so that binary sensor test will use non-numeric values for states.
* Using guard clause and changed debug to error
Changed to use a guard clause for state unknown.
Writing error on value error instead of debug.
* Add docstring
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