Check that an exp. is specified when viewing logs
Check that an exp. is specified when viewing logs

Closes #109.

berkeley-cocosci/Wallace,jcpeterson/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger,jcpeterson/Dallinger,Dallinger/Dallinger,Dallinger/Dallinger,berkeley-cocosci/Wallace,suchow/Wallace,Dallinger/Dallinger,suchow/Wallace,jcpeterson/Dallinger,jcpeterson/Dallinger,jcpeterson/Dallinger,berkeley-cocosci/Wallace,suchow/Wallace