Exception when passing arguments with -av and aspect does not have input arguments

[joaobispo]

When calling a LARA aspect by command-line with input arguments (e.g., -av {arg1:10}) and the main aspect does not have inputs, the following exception occurs:

Exception in thread "main" java.lang.RuntimeException:
During LARA Interpreter execution
caused by RuntimeException:
when evaluating javascript
caused by ScriptException: TypeError: Cannot get property "length" of null in at line number 23
caused by ECMAException: TypeError: Cannot get property "length" of null
at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)