Bug 316837, crash in [@ strchr - nsNSSCertificateDB::getCertNames] on cert without nickname

r=rrelyea

security/manager/ssl/src/nsNSSCertificateDB.cpp

@@ -1313,9 +1313,12 @@ nsNSSCertificateDB::getCertNames(CERTCertList *certList,
         namestr = node->cert->emailAddr;
       } else {
         namestr = node->cert->nickname;
-        char *sc = strchr(namestr, ':');
+        if (namestr) {
-        if (sc) *sc = DELIM;
+          char *sc = strchr(namestr, ':');
+          if (sc) *sc = DELIM;
+        }
       }
+      if (!namestr) namestr = "";
       nsAutoString certname = NS_ConvertASCIItoUTF16(namestr);
       certstr.Append(PRUnichar(DELIM));
       certstr += certname;