Return an Option from outline_glyph instead of a Path containing a null pointer
#100
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The
outline_glyphandoutline_glyph_with_ctmfunctions returned aPathcontaining a null pointer in case a glyph was unable to be outlined.fz_outline_glpyhtries to avoid throwing errors, does however throw one in case allocation fails. I'm not sure if i should keep the Result for that case.