code: def test_empty(self):
      primitive_func = self.primitive().get_function()
      times = pd.Series([], dtype="datetime64[ns]")
      booleans = pd.Series([], dtype="boolean")
      times = times.reset_index(drop=True)
      answer = primitive_func(
          times,
          booleans,
          time=self.cutoff_time,
      )
      assert pd.isna(answer)
  
imports: from datetime import datetime
  from math import isnan
  import numpy
  import pandas
  from featuretools.primitives import TimeSinceLastFalse, TimeSinceLastMax, TimeSinceLastMin, TimeSinceLastTrue
label_desc: Use image node_id 5 for calling the TestTimeSinceLastTrue obj's underlying member method code with example usage: obj.test_empty() without return types