TESTS: added a new test for FORM handling of empty series, according to issue #430 decision.
TESTS: added a new test for FORM handling of empty series, according to issue #430 decision.

vehar/red,red-eco/red,red-eco/red,rheber/red,NikolayShubenkovProgSchool/red,iArnold/red,iArnold/red,NikolayShubenkovProgSchool/red,vehar/red,rheber/red