text: Title: Modify `TestStructuredProfilerRowStatistics`: Update null stats tests
  Body: **Is your feature request related to a problem? Please describe.**
  The null stats tests in `TestStructuredProfilerRowStatistics` [link](https://github.com/capitalone/DataProfiler/blob/main/dataprofiler/tests/profilers/test_profile_builder.py#L3504)
   need to be updated to use the data that is created in `setUpClass` [link](https://github.com/capitalone/DataProfiler/blob/main/dataprofiler/tests/profilers/test_profile_builder.py#L3509). Currently they are using their own datasets
  
  
  **Describe the outcome you'd like:**
  The null stats tests should use the data initialized in the `setUpClass` class method, not their own data
  