Fix potential attempt to divide by zero in transformer

[marcusmoore]

This PR adds a guard against dividing by zero in the DepreciationReportTransformer.

[what-the-diff]

PR Summary

• Updated Asset Depreciation Conditions
  The logic in our asset depreciation processing procedures has been updated. It now verifies whether an asset's depreciation timeframe is longer than zero months before continuing with the depreciation process.

• Added New Test Case for Zero Depreciation Months
  To make certain our system can properly handle instances where an asset's depreciation period is set as zero months, we've integrated a new test case. This helps us ensure the consistency and reliability of our system.