Bugfix: small crasher in console function getWords()

Try the following:
echo(getWords("foo", 0, -1));

and you get a crash in tge 1.3 - tge 1.5.

the fix is simple:
consoleFunctions.cc
in static const char *getUnits(), find this line:

U32 totalSize = (U32(string - startString));

and right after it put these lines:

if (totalSize == 0)
      return "";

orion