rc1 parser still returns None metadata and subsequent code fails

[vedina]

ramanchada2/src/ramanchada2/io/experimental/rc1_parser/io.py

Line 38 in 7c8c5ff

metadata = cleanMeta(metadata)

The issue preventing .ngs files without metadata is not solved; cleanMetadata will do nothing if meta is None and the subsequent code at

ramanchada2/src/ramanchada2/io/experimental/rc1_parser/io.py

Line 40 in 7c8c5ff

metadata = dict(zip(metadata.keys(), [str(v) for v in metadata.values()]))

fails