revert: return error on launch_tool v fmt

src/server/features_formatting.v

@@ -11,13 +11,15 @@ pub fn (mut ls LanguageServer) formatting(params lsp.DocumentFormattingParams) !
 	uri := params.text_document.uri.normalize()
 	file := ls.get_file(uri) or { return error('Cannot format not opened file') }
 
-	os.write_file(temp_formatting_file_path, file.psi_file.source_text)!
+	os.write_file(temp_formatting_file_path, file.psi_file.source_text) or {
+		return error('Cannot write temp file for formatting: ${err}')
+	}
 
 	loglib.with_fields({
 		'uri': file.uri.str()
 	}).info('Formatting file')
 
-	mut fmt_proc := ls.launch_tool('fmt', os.norm_path(temp_formatting_file_path)) or { return [] }
+	mut fmt_proc := ls.launch_tool('fmt', os.norm_path(temp_formatting_file_path))!
 	defer {
 		fmt_proc.close()
 	}
@@ -40,6 +42,7 @@ pub fn (mut ls LanguageServer) formatting(params lsp.DocumentFormattingParams) !
 		errors := fmt_proc.stderr_slurp().trim_space()
 		ls.client.show_message(errors, .info)
 		return error('Formatting failed: ${errors}')
+		// return []
 	}
 
 	return [