Python bindings: usability improvements

[jmarrec]

Enhancement Request

• Add a __bool__ method for optionals

__bool__

OpenStudio/src/utilities/core/CommonImport.i

Lines 105 to 107 in 255c623

	#ifndef SWIGPYTHON
	operator bool() const;
	#endif

test for it:

import openstudio


def test_optional_not_initialized():
    d = openstudio.OptionalDouble()
    assert not d.is_initialized()
    assert not bool(d)


def test_optionalinitialized():
    d = openstudio.OptionalDouble(10.0)
    assert d.is_initialized()
    assert bool(d)