Fix exceptions and warnings

[IvanIvanoff]

• Fix cryptocompare assets endpoint in case of asset without slug
• Remove unused default parameter
• Properly handle price validator timeouts with catch
• Reintroduce sentiment_volume_consumed_4chan as a name of a metric

Changes

Ticket

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works