Check for None Metadata Root Record in search #309
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This commit checks whether there is actually a metadata root record (MRR) at a certain dataset path-level. It is wrong to assume that there is always an MRR, because the dataset tree can contain nodes that do not represent a dataset and have therefore no MRR.
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Should fix #305
This PR ensures that metalad checks whether there is actually a metadata root record (MRR) at a certain dataset path-level before trying to dump metadata.
It is wrong to assume that there is always an MRR, because the dataset tree can contain nodes that do not represent a dataset and have therefore no MRR.