Provide default report file.

[matz-e]

Fixes #617.

Please make sure that the following items are taken care of if needed:

• [x] Has the database format changed? (renamed or new columns, tables) Or did any of the project layout change? (files required to run the workflows)
  • Please increase the version number VERSION after the imports in lobster.util. This will ensure that Lobster does not try to load old projects with an incompatible version.
• [x] Did the required Work Queue version change?
  • Please update the three version numbers in doc/install.rst. Adjust the tarball name in the install_dependecies.sh script, too.
• [x] Are all additional dependencies in setup.py?
• [x] Mark any issues as closed either in commits or in this pull request.

[annawoodard]

Sorry about the delay! Thanks for implementing this! :clap: