Fix TypeError when protein description is not a string

Handle cases where protein description values may be non-string types
(e.g., NaN, float) by explicitly converting to string before truncation.
This prevents "TypeError: object of type 'float' has no len()" errors
when parsing FLASHTnT results.

Author: t0mdavid-m

src/parse/tnt.py

@@ -34,7 +34,7 @@ def parseTnT(file_manager, dataset_id, deconv_mzML, anno_mzML, tag_tsv, protein_
         }
     )
     protein_df['description'] = protein_df['description'].apply(
-        lambda x: x[:50] + '...' if len(x) > 50 else x
+        lambda x: str(x)[:50] + '...' if len(str(x)) > 50 else str(x)
     )
     file_manager.store_data(dataset_id, 'protein_dfs', protein_df)
     logger.log("30.0 %", level=2)