[bindings] allow null strings in Python 3
Some API calls accept 'NULL' instead of a char array (e.g. the second
argument to 'clang_ParseTranslationUnit'). For Python 3 compatibility,
all strings are passed through 'c_interop_string' which expects to
receive only 'bytes' or 'str' objects. This change extends this
behavior to additionally allow 'None' to be supplied.
A test case was added which breaks in Python 3, and is fixed by this
change. All the test cases pass in both, Python 2 and Python 3.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@316264
91177308-0d34-0410-b5e6-
96231b3b80d8