fix(ElasticsearchService): fix NullPointerException when facetRequests is null

solidify-index/src/main/java/ch/unige/solidify/index/indexing/elasticsearch/ElasticsearchService.java

@@ -452,10 +452,10 @@ public abstract class ElasticsearchService<T extends IndexMetadata> extends Inde
             }
           }
         }
+        // sort facets results as they were requested (Elasticsearch does not necessarily return facets in the same order as requested)
+        this.sortFacetResults(page.getFacetResults(), facetRequests);
       }
-      // sort facets results as they were requested (Elasticsearch does not necessarily returns facets in
-      // the same order as requested)
-      this.sortFacetResults(page.getFacetResults(), facetRequests);
+
       return page;
     } catch (IOException e) {
       throw new SolidifyRuntimeException("Error when searching index " + indexName + " with request " + q, e);