subtitlecomposer was updated to fix the following issues:

- fixed empty lines crash (fixes boo#1192342 boo#1171768)

Update to version 0.7.1

* Fixed theme/icons/look outside KDE environment
* Fixed various bugs and rare crashes
* Fixed Undo stack and improved text editing undo
* Improved/replaced Video player(s) (performance, Wayland
  support, OpenGL/FFmpeg)
* Improved Waveform performance
* Improved LinesWidget/Model performance
* Improved Wayland support
* Improved open/save file dialogs to use native dialogs
* Improved text charsets/encodings/end-of-line selection,
  detection and handling
* Improved VobSub support
* Improved inline editor to support text styles
* Improved subtitle style rendering
* Improved character/sec support and added coloring
* Improvide command line - ability to open all subtitle/media
  files
* Added Pause/Duration columns to list view
* Removed invalid subpicture/x-pgs mime
* Updated/added many translations - thanks to KDE community