Issue1746 validator no output

[M5Skid]

Description

Adds if loops to check for an empty file list before performing validation. An empty file list will throw a validation error instead of an exception. This can be set as a suppress-able error in params.json:

• "suppressed_errors": [
  {"check_name": "check_empty_filelist"}
  ]

Changelog

static.py

• Adds check for empty file list ("check_empty_filelist"), which will throw a validation failure if not suppressed.
• "check_missing_date_files" check only takes place if the file list is not empty.

validate.py

• Adds check for empty file list before calling aggregate_frames function.
• If list is empty, an empty dataframe is passed to avoid the concatenation exception.

test-static.py

• Changed name of test that will give a validation error. Empty file list test will now get the expected error on testing as part of the "check_empty_filelist" check.

Fixes

• Fixes Validator throws an exception when no output is produced by the indicator #1746

[krivard]

It's always nice when you can find a simple fix -- good work!

[krivard]

👍