Fix the expedite KPI card denominator issue.

[ranjith513]

fixing denominator missing issues

PR Checklist

• When there are no expedite deployments, _ExpediteDevicesDenominator variable is not causing kusto query to fail. The exception is not meaningful for the user to understand.
• Validate your changes using one or more of the testing methods.

If adding or updating templates:

• post a screenshot of templates and/or gallery changes
• ensure your template has a corresponding gallery entry in the gallery folder
• If you are adding a new template, add your team and template/gallery file(s) to the CODEOWNERS file. CODEOWNERS entries should be teams, not individuals
• ensure all steps have meaningful names
• ensure all parameters and grid columns have display names set so they can be localized
• ensure that parameters id values are unique or they will fail PR validation (parameter ids are used for localization)
• ensure that steps names are unique or they will fail PR validation (step names are used for localization)
• grep /subscription/ and ensure that your parameters don't have any hardcoded resourceIds or they will fail PR validation
• remove fallbackResourceIds and fromTemplateId fields from your template workbook or they will fail PR validation