Core

Problem
TYPO3 6.2.11 together with powermail 2.2.0 produced following error with a simple select field in a form.
No identifying value for object of class "" found.

Analysis
As far as I understood the code of SelectViewHelper from fluid the $value should be added to $options if it is an object or an array.
If it is an object it has to be preprocessed. Actually above exception is thrown if it is an array instead of adding it to $options.

Suggestion

      protected function getOptions() {
                [ ... ]
                $optionsArgument = $this->arguments['options'];
                foreach ($optionsArgument as $key => $value) {
-                        if (is_object($value)) || is_array($value)) {
+                        if (is_object($value)) {
                                if ($this->hasArgument('optionValueField')) {
                                       [ ... ]
                                }
                                [ ... ]
-                        }
-                        $options[$key] = $value;
+                        if (is_object($value)) || is_array($value)) {
+                                $options[$key] = $value;
+                        }