Amasty Address Attributes Magento Extension Bug

Amasty Address Attributes Notice Bug

Using Amasty Attributes to add Address attributes, the following error occurs after first save of Titles/Labels:

Notice: Array to string conversion  in /home/company/project/site/web/ app/design/adminhtml/default/default/template/ amaddressattr/attribute/options.phtml on line 46

#0 .../app/design/adminhtml/default/default/template/ amaddressattr/attribute/options.phtml(46): mageCoreErrorHandler(8, 'Array to string conversion', '.../app/design/adminhtml/default/default/template/ amaddressattr/attribute/options.phtml', 46, Array)

Test system configuration

Magento CE 1.7.0.2
Amasty Address Attributes 1.0.1

Quick Debugging

Trying to debug, modified the code like this:

                <tr>
                    <?php $_labels = $this->getLabelValues();
                    //MMA
                    ?>
                    <?php foreach ($this->getStores() as $_store):
                        Zend_Debug::dump($_store->getId(), 'store, ');
                        if (is_array($_labels[$_store->getId()])) { 

                        Zend_Debug::dump($_store->getId(), ' - for this storeid the label is array!');

                        $_labels[$_store->getId()] = implode(',', $_labels[$_store->getId()]);                         

                        }
                        //Zend_Debug::dump($_labels[$_store->getId()]);

                        ?>
                    <td>
                        <input class="input-text<?php if($_store->getId()==0): ?> required-option<?php endif; ?>"
                               type="text" name="frontend_label[<?php echo $_store->getId() ?>]"
                               value="<?php echo $this->htmlEscape($_labels[$_store->getId()]) ?>" />
                    </td>
                    <?php endforeach; ?>
                </tr>

The result is this:

Trying to quick fix

                <tr>
                <?php foreach ($this->getStores() as $_store): ?>
                    <th><?php echo $_store->getName() ?></th>
                <?php endforeach; ?>
                </tr>
                <tr>
                    <?php $_labels = $this->getLabelValues()?>
                    <?php foreach ($this->getStores() as $_store):?>
                    <td>
                        <input class="input-text<?php if($_store->getId()==0): ?> required-option<?php endif; ?>"
                               type="text" name="frontend_label[<?php echo $_store->getId() ?>]"
                               value="<?php echo $this->htmlEscape((is_array($_labels[$_store->getId()]) ? implode('', $_labels[$_store->getId()]) : $_labels[$_store->getId()])) ?>" />
                    </td>
                    <?php endforeach; ?>
                </tr>

Quick Fix Result

Managed to get Magento flow not to break, but it seems it does not set up further required database configuration, and we get this Notice message from a Magento core setup file.