Small bug fix for Enterprise CommCare Version Compliance

[jingcheng16]

strptime() argument 1 must be str, not None

Technical Summary

Related sentry error

Feature Flag

No

Safety Assurance

Safety story

Fixed a bug caught by sentry

Automated test coverage

QA Plan

No

Rollback instructions

• This PR can be reverted after deploy with no further considerations

Labels & Review

• Risk label is set correctly
• The set of people pinged as reviewers is appropriate for the level of risk of the change

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: corehq/apps/reports/util.py

Function	Unhandled Issue
get_commcare_version_and_date_from_last_usage	UnboundLocalError: local variable 'version' referenced before assignment /a/{domain}/enterprise... Event Count: 1

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: strptime() argument 1 must be str, not None /a/{domain}/enterprise/dashboard/{slug}/total/ View Issue

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