Read from csv debug (#1058)

* Types and Docstring update

* Update navigator_emergency.py

* error exception added

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Co-authored-by: Cameron Brown <me@cbrxyz.com>
Co-authored-by: cameron brown <52760912+cbrxyz@users.noreply.github.com>

mil_common/perception/mil_vision/mil_vision_tools/color_classifier.py

@@ -210,6 +210,8 @@ def read_from_csv(self, training_file: Optional[str] = None):
         Args:
             training_file (Optional[str]): The name of the training file.
         """
+        if training_file is None:
+            raise NotImplementedError("Cannot read without any training file.")
         training_file = _get_param(training_file, self.training_file)
         df = pandas.read_csv(training_file)
         classes = df.values[:, 1]