Merge pull request #94 from MCaller/master

[fix]: for Google authentication make sure the clientID is present when performing authorization

Author: auser

ios/OAuthManager/OAuthManager.m

@@ -294,7 +294,9 @@ - (NSDictionary *) getConfigForProvider:(NSString *)name
     NSMutableDictionary *cfg = [[manager getConfigForProvider:providerName] mutableCopy];
 
     DCTAuthAccount *existingAccount = [manager accountForProvider:providerName];
-    if (existingAccount != nil) {
+    NSString *clientID = ((DCTOAuth2Credential *) existingAccount).clientID;
+    if (([providerName isEqualToString:@"google"] && existingAccount && clientID != nil)
+        || (![providerName isEqualToString:@"google"] && existingAccount != nil)) {
         if ([existingAccount isAuthorized]) {
             NSDictionary *accountResponse = [manager getAccountResponse:existingAccount cfg:cfg];
             callback(@[[NSNull null], @{