message: Add error message on missing source file
diff: @@ -463,6 +463,8 @@ bool EditTab::loadElfFile(Program& program, QFile& file) {
  QFile srcFile(editorSrcFile);
  if (srcFile.open(QFile::ReadOnly)) {
  program.sourceHash = Program::calculateHash(srcFile.readAll());
  + } else {
  + throw ::dwarf::format_error("Could not find source file " + editorSrcFile.toStdString());
  }
  } catch (::dwarf::format_error& e) {
  std::string msg = "Could not load debug information: ";
  