From 7f6edd04a4aeffa65d349d51b1ca81cfd34549af Mon Sep 17 00:00:00 2001
From: Augustin Zidek <augustinzidek@google.com>
Date: Fri, 31 Jan 2025 08:54:37 -0800
Subject: [PATCH] Fix templates to work with empty a3m

Second fix needed for https://github.com/google-deepmind/alphafold3/issues/244

PiperOrigin-RevId: 721790067
Change-Id: Ib3eebf30f270b45d08cc94057a4feca5b4753d63
---
 src/alphafold3/data/templates.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/alphafold3/data/templates.py b/src/alphafold3/data/templates.py
index 7e80754..0de9eb1 100644
--- a/src/alphafold3/data/templates.py
+++ b/src/alphafold3/data/templates.py
@@ -517,6 +517,9 @@ def from_hmmsearch_a3m(
     """
 
     def hit_generator(a3m: str):
+      if not a3m:
+        return  # Hmmsearch could return an empty string if there are no hits.
+
       for hit_seq, hit_desc in parsers.lazy_parse_fasta_string(a3m):
         pdb_id, auth_chain_id, start, end, full_length = _parse_hit_description(
             hit_desc