fix crash in EditProfileViewModel

app/src/main/java/com/keylesspalace/tusky/viewmodel/EditProfileViewModel.kt

@@ -35,6 +35,7 @@ import io.reactivex.schedulers.Schedulers
 import okhttp3.MediaType
 import okhttp3.MultipartBody
 import okhttp3.RequestBody
+import org.json.JSONException
 import org.json.JSONObject
 import retrofit2.Call
 import retrofit2.Callback
@@ -199,7 +200,11 @@ class EditProfileViewModel  @Inject constructor(
                 if (!response.isSuccessful || newProfileData == null) {
                     val errorResponse = response.errorBody()?.string()
                     val errorMsg = if(!errorResponse.isNullOrBlank()) {
+                        try {
                             JSONObject(errorResponse).optString("error", null)
+                        } catch (e: JSONException) {
+                            null
+                        }
                     } else {
                         null
                     }