text: Title: Bug Report: Null columns not supported for Spark dataframe
  Body: ### Current Behaviour
  
  When attempting to profile a Spark dataframe that contains an entirely null column, the process errors.
  
  When the null column is of type integer, the error message is `KeyError: '50%'` as thrown by `ydata_profiling/model/spark/describe_numeric_spark.py:102, in describe_numeric_1d_spark(config, df, summary)`.
  
  When the null column is a string, the error message is `ZeroDivisionError: division by zero` as thrown by `ydata_profiling/model/spark/describe_supported_spark.py:31, in describe_supported_spark(config, series, summary)`.
  
  ### Expected Behaviour
  
  A profile should be produced for the Spark dataframe even with null value columns. The profiler works as expected for the same data when passed as a Pandas dataframe.
  
  ### Data Description
  
  Any Spark dataframe with an entirely null column:
  ```
  df.withColumn('empty1', lit(None).cast('string')).withColumn('empty2', lit(None).cast('integer'))
  ```
  
  ### Code that reproduces the bug
  
  ```Python
  # Follow the Spark Databricks example code: https://github.com/ydataai/ydata-profiling/blob/master/examples/integrations/databricks/ydata-profiling%20in%20Databricks.ipynb
  
  # Add the following lines to df before running ProfileReport
  df = (
    df
    .withColumn('empty1', lit(None).cast('string'))
    .withColumn('empty2', lit(None).cast('integer'))
  )
  ```
  
  
  ### pandas-profiling version
  
  v4.1.2
  
  ### Dependencies
  
  ```Text
  numpy==1.21.5
  pandas==1.4.2
  ydata-profiling==4.1.2
  ```
  
  
  ### OS
  
  _No response_
  
  ### Checklist
  
  - [X] There is not yet another bug report for this issue in the [issue tracker](https://github.com/ydataai/pandas-profiling/issues)
  - [X] The problem is reproducible from this bug report. [This guide](http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) can help to craft a minimal bug report.
  - [X] The issue has not been resolved by the entries listed under [Common Issues](https://pandas-profiling.ydata.ai/docs/master/pages/support_contrib/common_issues.html).