Nested IF THEN ELSE without DO block

[MadMx57]

It would be a good idea to add a rule to track the following ambiguous code in imbricated IF THEN ELSE.

Exemple :

IF myLogical THEN IF myOtherLogical THEN RUN first.p. ELSE RUN second.p.

Even if for expert eyes it is obvious to know to which IF the ELSE is referring to, I think it is a good idea to avoid such code (even if it is properly indented).

[gquerret]

Rule IfIndent should help. But the current implementation doesn't report anything with this indentation:

IF condition THEN
  IF condition2 THEN
    MESSAGE "1".
ELSE
  MESSAGE "2".

While indentation is wrong.

[gquerret]

Fixed as part of issue #1039