issue 152: simple fix for null pointer

[al-niessner]

🗒️ Summary

Set a value to null then accessed it causing a 500 error when doing this request:

curl --location --request GET 'http://localhost:8080/collections/urn:nasa:pds:insight_rad:data_derived::7.0/products?summary-only=true' --header 'Accept: application/json'

⚙️ Test Data and/or Report

Now works:

$ curl --location --request GET 'http://localhost:8080/collections/urn:nasa:pds:insight_rad:data_derived::7.0/products?summary-only=true' --header 'Accept: application/json'
{"summary":{"q":"","hits":7,"took":145,"start":0,"limit":100,"sort":[],"properties":[]}}

♻️ Related Issues

#152

[al-niessner]

@tloubrieu-jpl @jordanpadams

Fixed and ready to be merged into branch issue_134_r101

WARNING -- this PR must be merged prior to PR #161

[sonatype-lift]

UnusedVariable: This assignment to the local variable 'count' is never read.

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