fixed issue when parsing formula files

src/storm/parser/FormulaParserGrammar.cpp

@@ -133,7 +133,10 @@ namespace storm {
 
 #pragma clang diagnostic pop
 
-            start = ((qi::eps > filterProperty[phoenix::push_back(qi::_val, qi::_1)] | qi::eps(phoenix::bind(&FormulaParserGrammar::areConstantDefinitionsAllowed, phoenix::ref(*this))) >> constantDefinition | qi::eps) % +(qi::char_("\n;"))) >> qi::skip(boost::spirit::ascii::space | qi::lit("//") >> *(qi::char_ - (qi::eol | qi::eoi)))[qi::eps] >> qi::eoi;
+            start = (qi::eps >> filterProperty[phoenix::push_back(qi::_val, qi::_1)]
+                     | qi::eps(phoenix::bind(&FormulaParserGrammar::areConstantDefinitionsAllowed, phoenix::ref(*this))) >> constantDefinition
+                     | qi::eps)
+                     % +(qi::char_("\n;")) >> qi::skip(boost::spirit::ascii::space | qi::lit("//") >> *(qi::char_ - (qi::eol | qi::eoi)))[qi::eps] >> qi::eoi;
             start.name("start");
             
             // Enable the following lines to print debug output for most the rules.