Fix a bug in generate month : if the next month has less days than the first, but there are operations on non existings days, use last day of new month.

src/controller/KissCount.cpp

@@ -285,6 +285,13 @@ void KissCount::GenerateMonth(int monthFrom, int yearFrom, int monthTo, int year
 	    op._virtual = false;
 	    if (op.meta)
 		meta[it->id] = op.id;
+
+	    if (!QDate::isValid(op.year, op.month+1, op.day+1))
+	    {
+		QDate d(op.year, op.month+1, 1);
+		op.day = d.daysInMonth()-1;
+	    }
+
             (*_user->_operations[yearTo])[monthTo].push_back(op);
 	}