fix for a crash on misconfigured server

Author: or-else

app/src/main/java/co/tinode/tindroid/PasswordResetFragment.java

@@ -174,7 +174,7 @@ private String validateCredential(LoginActivity parent, @Nullable String method)
     private void clickRequest(View button) {
         final LoginActivity parent = (LoginActivity) requireActivity();
 
-        String method = mCredMethods[0];
+        String method = mCredMethods != null && mCredMethods.length > 0 ? mCredMethods[0] : null;
         final String value = validateCredential(parent, method);
         if (TextUtils.isEmpty(value)) {
             return;