Update graphgen/models/searcher/db/rnacentral_searcher.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: CHERRY-ui8

graphgen/models/searcher/db/rnacentral_searcher.py

@@ -59,7 +59,7 @@ def _rna_data_to_dict(
             if s := acc.get("species"):
                 organisms.add(s)
             gene_value = acc.get("gene")
-            if gene_value and isinstance(gene_value, str) and (g := gene_value.strip()):
+            if isinstance(gene_value, str) and (g := gene_value.strip()):
                 gene_names.add(g)
             if m := xref.get("modifications"):
                 modifications.extend(m)