fix: drop errors in form submissions to myep api silently

public/typo3conf/ext/ep_theme/Classes/Form/BpnApiFinisher.php

@@ -23,16 +23,31 @@ class BpnApiFinisher extends AbstractFinisher
 
     protected function executeInternal()
     {
-        $values = [];
-        $formValues = $this->finisherContext->getFormValues();
-        $mappingOption = $this->parseOption('mapping');
-        $mappings = GeneralUtility::trimExplode(',', $mappingOption, true);
-        foreach ($mappings as $mapping) {
-            [$remote, $local] = GeneralUtility::trimExplode(':', $mapping);
-            $values[$remote] = $formValues[$local];
-        }
-        if (count($values) > 0) {
-            $this->apiClient->registerAddress($values);
+        try {
+            $values = [];
+            $formValues = $this->finisherContext->getFormValues();
+            $mappingOption = (string)$this->parseOption('mapping');
+            $mappings = GeneralUtility::trimExplode(',', $mappingOption, true);
+
+            foreach ($mappings as $mapping) {
+                $parts = GeneralUtility::trimExplode(':', $mapping, true, 2);
+                if (2 !== count($parts)) {
+                    continue;
+                }
+
+                [$remote, $local] = $parts;
+                if ('' === $remote || '' === $local || false === array_key_exists($local, $formValues)) {
+                    continue;
+                }
+
+                $values[$remote] = $formValues[$local];
+            }
+
+            if ([] !== $values) {
+                $this->apiClient->registerAddress($values);
+            }
+        } catch (\Throwable $e) {
+            // Intentionally ignore all errors so the form submission stays silent.
         }
     }
 }