Fix linting errors

ale_linters/dart/analysis_server.vim

@@ -14,6 +14,7 @@ endfunction
 function! ale_linters#dart#analysis_server#GetCommand(buffer) abort
     let l:executable = ale#Var(a:buffer, 'dart_analysis_server_executable')
     let l:dart = resolve(exepath(l:executable))
+
     return '%e '
     \   . fnamemodify(l:dart, ':h') . '/snapshots/analysis_server.dart.snapshot'
     \   . ' --lsp'