NullPointerException is thrown when a script file contains empty lines at the end of file

[czpilar]

4.0.0 GA

Consider two files:

1. c:/shell.txt with content:

   @c:/shell2.txt
   help
   

2. c:/shell2.txt with content where there are empty lines at the end:

   help
   
   
   

In shell run script -- c:/shell.txt it ends with Unable to run command script: Cannot invoke "String.isEmpty()" because "input" is null.

[czpilar]

Fixed in PR #1258