Add check for null to avoid a NullReferenceException if the HockeyAppId is not set.
Add check for null to avoid a NullReferenceException if the HockeyAppId is not set.

Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz,Microsoft/HealthClinic.biz