Add check for invalid dotted attribute names in expressions
Add check for invalid dotted attribute names in expressions

This provides better feedback for typos and mistakes.

whowutwut/confluent,xcat2/confluent,whowutwut/confluent,jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent