hgext/__init__.py

patch: simplify Boolean expression slightly

The context variable is either True, False or None. Abbreviate it as C
and we get the following truth table where the second column is the
original expression and the third column is the new expression:

  C     | C or C == None | C is not False
  True  | True           | True
  False | False          | False
  None  | True           | True

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