add some err checking to sqlite case for nonce checking

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14322 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/sofia_glue.c

@@ -4016,11 +4016,16 @@ char *sofia_glue_execute_sql2str(sofia_profile_t *profile, switch_mutex_t *mutex
 
 		while (running < 5000) {
 			int result = switch_core_db_step(stmt);
+			const unsigned char *txt;
 
 			if (result == SWITCH_CORE_DB_ROW) {
-				if ((colcount = switch_core_db_column_count(stmt))) {
-					switch_copy_string(resbuf, (char *) switch_core_db_column_text(stmt, 0), len);
-					ret = resbuf;
+				if ((colcount = switch_core_db_column_count(stmt)) > 0) {
+					if ((txt = switch_core_db_column_text(stmt, 0))) {
+						switch_copy_string(resbuf, (char *) txt, len);
+						ret = resbuf;
+					} else {
+						goto fail;
+					}
 				}
 				break;
 			} else if (result == SWITCH_CORE_DB_BUSY) {

src/switch_core_db.c

@@ -57,7 +57,14 @@ SWITCH_DECLARE(int) switch_core_db_close(switch_core_db_t *db)
 
 SWITCH_DECLARE(const unsigned char *) switch_core_db_column_text(switch_core_db_stmt_t *stmt, int iCol)
 {
-	return sqlite3_column_text(stmt, iCol);
+    const unsigned char *txt = sqlite3_column_text(stmt, iCol);
+
+    if (txt && !strcasecmp((char *)txt, "(null)")) {
+        txt = NULL;
+    }
+
+    return txt;
+
 }
 
 SWITCH_DECLARE(const char *) switch_core_db_column_name(switch_core_db_stmt_t *stmt, int N)