message: verilog: tools: ls: symbol-table-handler: Continue search for definition without filelist
  If verible.filelist is not present in the workspace, we can still
  look for symbols in currently opened buffers, especially the current
  buffer.
  This commit removes exiting upon missing verible.filelist file
diff: @@ -199,9 +199,7 @@ std::vector<verible::lsp::Location> SymbolTableHandler::FindDefinition(
  const verible::lsp::DefinitionParams &params,
  const verilog::BufferTrackerContainer &parsed_buffers) {
  const absl::Time finddefinition_start = absl::Now();
  - bool filelist_loaded =
  LoadProjectFileList(curr_project_->TranslationUnitRoot());
  - if (!filelist_loaded) return {};
  if (files_dirty_) {
  std::vector<absl::Status> diagnostics = BuildProjectSymbolTable();
  bool success = true;
  