update

Author: Amit-CloudSufi

src/main/java/io/cdap/plugin/http/common/http/OAuthUtil.java

@@ -148,7 +148,7 @@ public static AccessToken getAccessTokenByClientCredentials(CloseableHttpClient
             new BasicNameValuePair("grant_type", OAuth2GrantType.CLIENT_CREDENTIALS.getValue()));
         nameValuePairs.add(new BasicNameValuePair("client_id", config.getClientId()));
         nameValuePairs.add(new BasicNameValuePair("client_secret", config.getClientSecret()));
-        if (config.getScopes() != null) {
+        if (!Strings.isNullOrEmpty(config.getScopes())) {
           nameValuePairs.add(new BasicNameValuePair("scope", config.getScopes()));
         }
         httppost = new HttpPost(uri);
@@ -157,7 +157,7 @@ public static AccessToken getAccessTokenByClientCredentials(CloseableHttpClient
         URIBuilder uriBuilder = new URIBuilder(config.getTokenUrl()).setParameter("client_id",
                 config.getClientId()).setParameter("client_secret", config.getClientSecret())
             .setParameter("grant_type", OAuth2GrantType.CLIENT_CREDENTIALS.getValue());
-        if (config.getScopes() != null) {
+        if (!Strings.isNullOrEmpty(config.getScopes())) {
           uriBuilder.setParameter("scope", config.getScopes());
         }
         uri = uriBuilder.build();