Merge pull request #3221 from 1c-syntax/feature/fixErr

исправление ошибки приведения типа

src/main/java/com/github/_1c_syntax/bsl/languageserver/diagnostics/RefOveruseDiagnostic.java

@@ -248,6 +248,7 @@ private List<String> getTabularSectionNames(SDBLParser.MdoContext mdo) {
       .map(configuration::findChild)
       .filter(Optional::isPresent)
       .map(Optional::get)
+      .filter(TabularSectionOwner.class::isInstance)
       .map(TabularSectionOwner.class::cast)
       .flatMap(RefOveruseDiagnostic::getTabularSectionNames)
       .collect(Collectors.toList());