Currently, it's not possible to do something like

if ( 1==1 ) then
( var := 'x' )
end;

as the parser will complain about a missing else. This could potentially be fine, since if you don't want an else you can use a no-op like

if ( 1==1 ) then
( var := 'x' )
else
()
end;

However, code like that can fail with the CachingParser if the if branch is empty. For instance,

if ( 1=== 1 ) then
() 
else ( false )
end;

Yes, that could be inverted to make the else branch empty, but people should not be forced to do so. Instead, I'd propose to:

1. Accept ifs without an else
2. Require that the if condition is not empty

As a temporary workaround, it could also be fine to make CachingParser support empty conditions, but anyway we have to fix the issue before deploying CachingParser in prod.