Don't handle a missing storage file error when reading

When you first install toodoo, you don't necessarily have a storage file
in ~/.toodoos.json which was originally causing an error.

Fact is, if this file doesn't exist, it doesn't matter, as the process
of adding a todo will create this file for you.
Merge pull request #14 from mikespokefire/hotfix/create-missing-storage-file

Don't handle a missing storage file error when reading