[BUGFIX] Fixes for runtime issues noticed in tests with main branch (kitodo#1430)

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Co-authored-by: Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>

Author: stweil

Classes/Controller/OaiPmhController.php

@@ -390,7 +390,7 @@ protected function verbGetRecord()
      */
     protected function verbIdentify()
     {
-        $library = $this->libraryRepository->findByUid($this->settings['library']);
+        $library = $this->libraryRepository->findByUid($this->settings['library'] ?? 0);
 
         $oaiIdentifyInfo = [];
 
@@ -642,7 +642,12 @@ protected function fetchDocumentSet(): array
 
         $solrQuery .= ' AND timestamp:[' . $from . ' TO ' . $until . ']';
 
-        $solr = Solr::getInstance($this->settings['solrcore']);
+        $solrcore = $this->settings['solrcore'] ?? false;
+        if (!$solrcore) {
+            $this->logger->error('Solr core not configured');
+            return $documentSet;
+        }
+        $solr = Solr::getInstance($solrcore);
         if (!$solr->ready) {
             $this->logger->error('Apache Solr not available');
             return $documentSet;