ProcessExpressionParameter should Trim.

Previously, these would break empty-string checks and cause an exception:

Components: " "
ArchitecturesAllowed=" "

Projects/Src/Compile.pas

@@ -2993,7 +2993,7 @@ procedure TSetupCompiler.ProcessExpressionParameter(const ParamName,
 var
   SimpleExpression: TSimpleExpression;
 begin
-  ProcessedParamData := ParamData;
+  ProcessedParamData := Trim(ParamData);
 
   if ProcessedParamData <> '' then begin
     if SlashConvert then