def dropna(self):
        result = self[self.notnull()]
        if isnull(result.categories).any():
            result = result.remove_categories([np.nan])
        return result
Builds the node OS structures.
dataset/ETHPy150Open pydata/pandas/pandas/core/categorical.py/Categorical.dropna--crossover with--dataset/ETHPy150Open ganeti/ganeti/lib/cmdlib/cluster/verify.py/LUClusterVerifyGroup._UpdateNodeOS