Misra: improve misra.py (#3343)

addons/misra.py

@@ -3384,7 +3384,7 @@ class MisraChecker:
             elif len(self.ruleTexts) == 0:
                 errmsg = 'misra violation (use --rule-texts=<file> to get proper output)'
             else:
-                return
+                errmsg = 'misra violation %s with no text in the supplied rule-texts-file' % (ruleNum)
 
             if self.severity:
                 cppcheck_severity = self.severity
@@ -3842,10 +3842,12 @@ Format:
 
 <..arbitrary text..>
 Appendix A Summary of guidelines
-Rule 1.1
+Rule 1.1 Required
 Rule text for 1.1
-Rule 1.2
+continuation of rule text for 1.1
+Rule 1.2 Mandatory
 Rule text for 1.2
+continuation of rule text for 1.2
 <...>
 
 '''