Improve ensure specs error handling

[n1mus]

Upon deployment, some local specs are checked against the ArangoDB server specs:

• collection indexes
• views
• analyzers

Currently, upon deployment, misconfigured analyzers and collection indexes will cause the RE to crash, but also to do so before outputting a neat list of misconfigured specs, so that the exceptions raised will probably be useless to anyone except the person familiar with those specs and the spec checking.

Screenshots of premature exceptions upon encountering misconfigured specs:

• analyzer
• collection index