I expected that a FOR TO ... cycle support nulls.

When a argument is null, the cycle have to be skipped.

Repro:

CLEAR

nInitialValue	=1
nFinalValue		=1
nIncrement		=1

? 'Expected print OK '
FORNEXT()

nInitialValue	=1
nFinalValue		=1
nIncrement		=null

? 'Expected print none'
FORNEXT()

nInitialValue	=null
nFinalValue		=null
nIncrement		=1

? 'Expected print none'
FORNEXT()

PROCEDURE FORNEXT
TRY
	FOR VarName = nInitialValue TO nFinalValue STEP nIncrement
		? ' ----  OK   ----- '
	NEXT
CATCH
	? ' ----  '+MESSAGE()+'  ----- '
ENDTRY