fix db select errors

@@ -709,6 +709,7 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
         }
         @catch (NSException *exception) {
            NSLog(@"SELECT accessToken error: %@", exception.reason);
+            accessToken = @"";
         }
         @finally {
 //           NSLog(@"Finally condition");
@@ -724,36 +725,81 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
 };
 
 - (NSString*)getRefreshToken {
-    NSString *refreshToken = [NSString alloc];
+//    NSString *refreshToken = [NSString alloc];
+    NSString *refreshToken = @"";
     if ([_db tableExists:@"requestVariables"] == YES) {
+        @try {
             FMResultSet *refreshTokenSet = [_db executeQuery:@"SELECT refresh_token FROM requestVariables WHERE id = 1;"];
             while ([refreshTokenSet next]) {
                 refreshToken = [[refreshTokenSet resultDictionary][@"refresh_token"] stringValue];
             }
+        }
+        @catch (NSException *exception) {
+           NSLog(@"SELECT refreshToken error: %@", exception.reason);
+            refreshToken = @"";
+        }
+        @finally {
+//           NSLog(@"Finally condition");
+        }
+        
+//        FMResultSet *refreshTokenSet = [_db executeQuery:@"SELECT refresh_token FROM requestVariables WHERE id = 1;"];
+//        while ([refreshTokenSet next]) {
+//            refreshToken = [[refreshTokenSet resultDictionary][@"refresh_token"] stringValue];
+//        }
         return refreshToken;
     }
     return @"";
 }
 
 - (NSString*)getClientId {
-    NSString *clientId = [NSString alloc];
+//    NSString *clientId = [NSString alloc];
+    NSString *clientId = @"";
     if ([_db tableExists:@"requestVariables"] == YES) {
+        @try {
             FMResultSet *clientIdSet = [_db executeQuery:@"SELECT client_id FROM requestVariables WHERE id = 1;"];
             while ([clientIdSet next]) {
                 clientId = [[clientIdSet resultDictionary][@"client_id"] stringValue];
             }
+        }
+        @catch (NSException *exception) {
+           NSLog(@"SELECT clientId error: %@", exception.reason);
+            clientId = @"";
+        }
+        @finally {
+//           NSLog(@"Finally condition");
+        }
+        
+//        FMResultSet *clientIdSet = [_db executeQuery:@"SELECT client_id FROM requestVariables WHERE id = 1;"];
+//        while ([clientIdSet next]) {
+//            clientId = [[clientIdSet resultDictionary][@"client_id"] stringValue];
+//        }
         return clientId;
     }
     return @"";
 }
 
 - (NSString*)getClientSecret {
-    NSString *clientSecret = [NSString alloc];
+//    NSString *clientSecret = [NSString alloc];
+    NSString *clientSecret = @"";
     if ([_db tableExists:@"requestVariables"] == YES) {
+        @try {
             FMResultSet *clientSecretSet = [_db executeQuery:@"SELECT client_secret FROM requestVariables WHERE id = 1;"];
             while ([clientSecretSet next]) {
                 clientSecret = [[clientSecretSet resultDictionary][@"client_secret"] stringValue];
             }
+        }
+        @catch (NSException *exception) {
+           NSLog(@"SELECT clientSecret error: %@", exception.reason);
+            clientSecret = @"";
+        }
+        @finally {
+//           NSLog(@"Finally condition");
+        }
+        
+//        FMResultSet *clientSecretSet = [_db executeQuery:@"SELECT client_secret FROM requestVariables WHERE id = 1;"];
+//        while ([clientSecretSet next]) {
+//            clientSecret = [[clientSecretSet resultDictionary][@"client_secret"] stringValue];
+//        }
         return clientSecret;
     }
     return @"";