Allow empty ${option.name} and eliminate special case handling in scripts

When trying to create a job which called a script with the calling convention "scriptname [option1] [option2]", after reading documentation 1.2.0, section 6.5, I realized that RunDeck does not handle a default option that is empty. For undefined options (ie in my case, a normal calling convention), I must update my scripts to handle RunDeck's expectation that ${option.name} will not be defined.

I'd like to propose that RunDeck handle an unsupplied optional option differently. Instead of not defining the option, requiring any called script to be update, just set the option to nothing. Perhaps a checkbox saying "Allow option to be empty". This would allow Rundeck to call existing scripts like my example above which is pretty standard.

If it did this, then one could configure a job step like this:

Path: /path/to/script
Commandline arguments: ${option.name}

Then scripts could be run as-is, and not have to be updated to deal with a nonexistent ${option.name}. If using variable replacement syntax the model would be to always reference it in quotes:

#!/bin/sh VAR1="@OPTION.NAME@"

When empty, it would resolve to
VAR1=""

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