Permissions/IO errors can cause nullpointerexception

[rfmerrill]

starting at line 1223 in app/Base.java, addLibraries calls Compiler.headerListFromIncludePath

It then immediately uses the returned value without checking for null first.

Compiler.headerListFromIncludePath returns the return value of File.list(), which can return null if an IO error occurs.

This results in nullpointerexception if said directory has permissions that don't allow you to list() it.

[ffissore]

Hello @rfmerrill I've pushed the fix to branch https://github.com/arduino/Arduino/tree/master-issue1160 (ide version 1.0.x) and to branch https://github.com/arduino/Arduino/tree/ide-1.5.x-issue1160 (ide version 1.5.x)

Can you test one and report back if the IDE is showing an error message or if it keeps on crashing?

[rfmerrill]

Unfortunately I just tracked the error down, I wasn't the one experiencing it. I could try and find the time to test it, but it might be a while.