Merge pull request #9 from yoshimin/master

Don't throw error even if current token is null

Author: onevdog

android/src/main/kotlin/com/linecorp/flutter_line_sdk/LineSdkWrapper.kt

@@ -182,11 +182,7 @@ class LineSdkWrapper(
                     )
                 )
             } else {
-                result.error(
-                    lineApiResponse.responseCode.name,
-                    lineApiResponse.errorData.message,
-                    null
-                )
+                result.success(null)
             }
         }
     }