RFC conform handling for grant_type=refresh_token without code

in case of grant_type=refresh_token there is no code
spaces to tabs formating corrected

Author: psytester

src/main/java/com/docusign/esign/client/auth/OAuthJerseyClient.java

@@ -49,25 +49,25 @@ public <T extends OAuthClientResponse> T execute(OAuthClientRequest request, Map
 				code = value;
 			} else if ("client_id".equals(key)) {
 				clientId = value;
-            } else if ("client_secret".equals(key)) {
-                clientSecret = value;
-            }
-        }
+			} else if ("client_secret".equals(key)) {
+				clientSecret = value;
+			}
+		}
 
-        if (grantType == null) {
-            throw new OAuthSystemException("Missing grant_type");
-        }
-        if (!grantType.equals(GrantType.REFRESH_TOKEN.toString()) && code == null) {
-            throw new OAuthSystemException("Missing code for grant_type="+grantType);
-        }
+		if (grantType == null) {
+			throw new OAuthSystemException("Missing grant_type");
+		}
+		if (!grantType.equals(GrantType.REFRESH_TOKEN.toString()) && code == null) {
+			throw new OAuthSystemException("Missing code for grant_type="+grantType);
+		}
 
-        if (code == null) {
-            body = "grant_type=" + grantType;
-        } else {
-            body = "grant_type=" + grantType + "&code=" + code;
-        }
+		if (code == null) {
+			body = "grant_type=" + grantType;
+		} else {
+			body = "grant_type=" + grantType + "&code=" + code;
+		}
 
-        if (clientId == null || clientSecret == null) {
+		if (clientId == null || clientSecret == null) {
 			throw new OAuthSystemException("Missing clientId/secret");
 		} else {
 			byte[] bytes = (clientId + ":" + clientSecret).getBytes();