ml-inscript: Correct the mapping of ഠ

It used the same key of ട
Avoid javascript error while tryting to get autonym

For the purpose of tests, we pass language that is known to ime
and that cause js error at $.ime.languages[languageCode].autonym

Added a null check
Remove unwanted escape for double quotes from rules files
Merge pull request #334 from jishnu7/master

Devanagari letter TTHA was incorrectly mapped
fix mapping of Oriya letters TTA and TTHA

oriya letters TTA and TTHA are correcly mapped to ` and ~.
Verified this with XKB.