BUG Remove non-displayable chars from Solr highlight results

code/solr/SolrIndex.php

@@ -440,6 +440,9 @@ abstract class SolrIndex extends SearchIndex {
 							$combinedHighlights = array_merge($combinedHighlights, $highlights);
 						}
 						$result->Excerpt = DBField::create_field('HTMLText', implode(' ... ', $combinedHighlights));
+						// Remove entity-encoded U+FFFD REPLACEMENT CHARACTER. 
+						// It signifies non-displayable characters, and shows up as such itself in browsers (questionmark icon)
+						$result->Excerpt = str_replace('�', '', $result->Excerpt);
 					}
 				}
 			}