message: Add log message to outline
  A log is printed when outline is unable to resolve a filename.
  This is related to
diff: @@ -179,6 +179,10 @@ export class SectionNodeProvider implements vscode.TreeDataProvider<Section> {
  inputFilePath = this.extension.manager.resolveFile([path.dirname(filePath), this.extension.manager.rootDir], result[3])
  }
  + if (!inputFilePath) {
  + this.extension.logger.addLogMessage(`Could not resolve included file ${filePath}`)
  + continue
  + }
  if (path.extname(inputFilePath) === '') {
  inputFilePath += '.tex'
  }
  