catch missing closing braces outside any scope as well

it doesn't make a whole lot of sense, but it's possible to create
braced blocks which have no semantic meaning.

Change-Id: Id55dfdee1aa3fade507cbd1eb34bdffcd7eb6bff
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

qmake/library/qmakeparser.cpp

@@ -841,7 +841,7 @@ void QMakeParser::read(ProFile *pro, const QString &in, int line, SubGrammar gra
     }
 
     flushScopes(tokPtr);
-    if (m_blockstack.size() > 1)
+    if (m_blockstack.size() > 1 || m_blockstack.top().braceLevel)
         parseError(fL1S("Missing closing brace(s)."));
     while (m_blockstack.size())
         leaveScope(tokPtr);