JS: remove handling of zero-argument KeywordIndex from EntityInput.parse
JS: remove handling of zero-argument KeywordIndex from EntityInput.parse

We use the zero-arg case to mean reset to default value and as such never call parse
in this case.

Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim