Fixed computationRefs returning 404 for an empty result

[zack-rma]

Problem Description

Fixes #426.

Solution

Removed thrown 404 for empty result set. Updated test cases to match change.

how you tested the change

Integration tested against OpenTSDB and CWMS database instances.

Where the following done:

• Tests. Check all that apply:
  • Unit tests created or modified that run during ant test.
  • Integration tests created or modified that run during integration testing
    (Formerly called regression tests.)
  • Test procedure descriptions for manual testing
• Was relevant documentation updated?
• Were relevant config element (e.g. XML data) updated as appropriate

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