fix overeager parser preprocessor #4313
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Identify the Bug or Feature request
Fixes #4312
Description of the Change
The change in PR #4304 was a bit overeager when trying to preprocess advanced rolls. This change ensures that the preprocessing will only occur when there is nothing else in the expression (other than white space).
Possible Drawbacks
There should be none, as the result can't sensibly be assigned to a variable or take part in arithmetic operations etc.
Documentation Notes
Fixes problems with if and strings that end with a letter and !
Release Notes
This change is