Wdfn 791 title info icon does not have text

Before making a pull request

• Put the appropriate EXEMPT flag if needed in the MR title (see https://practices.wma.chs.usgs.gov/practice/peer_code_review/)
• Run all linters (make lint)
• Run all tests (make test)
• Update the changelog appropriately
• If making a release, update code.json, versionNumber and metadataLastUpdated.

Description WWDFN 791 Title Info Icon Does Not Have Text

Fixes two issues by:

• checking for both a null hydrographData object and a hydrograhData object without a 'description' key
• allowing user's clicks to register through the 'no data' graph overlay

After making a pull request

• If appropriate, put the link to the PR in the JIRA ticket
• Assign someone to review unless the change is trivial