migrations should fail

[mixmix]

Right now our migrations fail silently ... errors are caught and then the migrations seem to just progress D:

We need to change that behaviour to not progress the migrations if they don't run

[mixmix]

Expected behaviour

If a migration throws an error:

• the migration-version should not be progressed
• the config should not be written
• a helpful error should be output
• the entropy application should NOT launch

If the user manually addresses the issue

• the migrations should continue as normal

Examples of things which could cause throw

• missing field/ key
• empty config
• ... (you think of some)