Classification Statistics fail

Calculation of classification statistics (runClassificationStatistics) fails after the results are to be evaluated with “eval”.

How to reproduce:

Open a classification raster in a map view
Open raster layer context menu and run “Classification Statistics”

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Traceback (most recent call last):
  File "C:\Users\geo_beja\Repositories\enmap-box\enmapbox\gui\dataviews\dockmanager.py", line 1508, in <lambda>
    action.triggered.connect(lambda: self.runClassificationStatistics(lyr))
  File "C:\Users\geo_beja\Repositories\enmap-box\enmapbox\gui\dataviews\dockmanager.py", line 1630, in runClassificationStatistics
    categories = eval(result[alg.P_OUTPUT_CATEGORIES])
  File "<string>", line 1, in <module>
NameError: name 'Category' is not defined

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Affected code: enmapbox/gui/dataviews/dockmanager.py

    def runClassificationStatistics(self, layer):
        from hubdsm.processing.classificationstatistics import ClassificationStatistics, ClassificationStatisticsPlot
        alg = ClassificationStatistics()
        io = {alg.P_CLASSIFICATION: layer}
        result = Processing.runAlgorithm(alg, parameters=io, feedback=QgsProcessingFeedback())
        categories = eval(result[alg.P_OUTPUT_CATEGORIES])
        counts = eval(result[alg.P_OUTPUT_COUNTS])
        widget = ClassificationStatisticsPlot(categories=categories, counts=counts, layer=layer,
                                              parent=self.mDockTreeView)
        widget.show()

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