navtable/navtableforms — comment on commit f8e0186ae62f5b33c9d95ce1f281c6502c6ddb0a
File:  line 0
By fpuga:

I agree with @jorgelf

I like null or raise a [IllegalArgumentException](http://stackoverflow.com/questions/3881/illegalargumentexception-or-nullpointerexception-for-a-null-parameter)