Describe the bug

When initializing a Column in the init method, the ColumnType is setted by the from_numpy_data_type method. This method in column_type is using the np.dtime.kind function. In the test_has_missing_values test, Columns with numeric parameters / None are initialized, but the Columntype is detected as a String (which is wrong).

To Reproduce

1. Go to test_has_missing_values
2. Run the test including the print method
3. Look at the error message with the types printed out

Expected behavior

Analyze the source code and try to find the reason for the bug.

Screenshots (optional)

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Additional Context (optional)

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