Empty version strings not parsed correctly

[Jon Nicholson]

In the case that a ZIS returns a message with an empty Version attribute, i.e. Version="", the ADK will error with a string out of bounds exception rather than an appropriate illegal argument exception.

There is an easy fix. The method "static SIFVersion parse(String)" in the com.edustructures.sifworks.SIFVersion class needs an additional catch block at the end of the method such as:

catch (StringIndexOutOfBoundsException nfe) {
 throw new IllegalArgumentException("\"" + versionStr + "\" is an invalid version string", nfe);
}

This reports a more informative exception.