refs #19156 [finc] improve getPages function

* change return priority (first start to end page, last only start page)
* remove bug: pages string can have more than one char

module/finc/src/finc/RecordDriver/SolrAI.php

@@ -321,12 +321,10 @@ class SolrAI extends SolrDefault implements
         $pages = $this->getAIRecord('rft.pages');
         if (!empty($spage) && !empty($epage)) {
             return sprintf('%s-%s', $spage, $epage);
-        } elseif (!empty($spage)) {
-            return $spage[0];
-        } elseif (!empty($epage)) {
-            return $epage[0];
         } elseif (!empty($pages)) {
             return $pages;
+        } elseif (!empty($spage)) {
+            return $spage;
         }
 
         return '';