diff --git a/src/idpyoidc/storage/listfile.py b/src/idpyoidc/storage/listfile.py
index ffa910d7..8ee037b1 100644
--- a/src/idpyoidc/storage/listfile.py
+++ b/src/idpyoidc/storage/listfile.py
@@ -81,10 +81,7 @@ def _read_info(self, fname):
                     fp = open(fname, "r")
                     info = [x.strip() for x in fp.readlines()]
                 lock.release()
-                if info == "":
-                    return None
-                else:
-                    return info
+                return info or None
             except Exception as err:
                 logger.error(err)
                 raise
diff --git a/tests/pub_iss.jwks b/tests/pub_iss.jwks
index 9b062907..77081f40 100644
--- a/tests/pub_iss.jwks
+++ b/tests/pub_iss.jwks
@@ -1 +1 @@
-{"keys": [{"kty": "EC", "use": "sig", "kid": "SmdKMlVGcG1zMnprdDdXZGpGWEczdHhlZVpGbkx1THpPdUY4d0w4bnZkSQ", "crv": "P-256", "x": "tRHJYm0fsOi0icpGEb33qiDVgt68ltMoYSWdLGhDGz4", "y": "fRpX0i6p5Jigf5I0qwW34PyStosMShwWAWS8x_w5o7E"}, {"kty": "RSA", "use": "sig", "kid": "R0FsaFdqREFaUFp1c0MwbUpsbHVSZ200blBJZWJVMTUtNGsyVlBmdHk5UQ", "e": "AQAB", "n": "2ilgsKVqF92KfhwmosSVeZOaDgb3RF1mbg-pqkmLO6YpOO06LF4V4angF-GhP-ysAm2E75aSIU4tnHVThFlcxTgKFqjYKJQXyVzTVK2r-L2IbvFPaDtvoU6WteybpMlIUVk2po3cFDGObCWYKCm7CUOLlwH0uOpui66P9VSCqdKVKbJRAQBvTSbP10KWPxulfqjWGJtHO5fY7-JVWwOBkG-eHSJIT_uaoPjyvKCZjknq04bLUV9qP78KRQpRyYijBN60w2v8F79baN9CN10TIEjjWKGz0uX0M_YYQzTUoSY5l5ka9RkL3wT4o2iQ1t5nHphX6aA-gqwgCQmi-nvjaw"}]}
\ No newline at end of file
+{"keys": [{"kty": "EC", "use": "sig", "kid": "SmdKMlVGcG1zMnprdDdXZGpGWEczdHhlZVpGbkx1THpPdUY4d0w4bnZkSQ", "crv": "P-256", "x": "tRHJYm0fsOi0icpGEb33qiDVgt68ltMoYSWdLGhDGz4", "y": "fRpX0i6p5Jigf5I0qwW34PyStosMShwWAWS8x_w5o7E"}, {"kty": "RSA", "use": "sig", "kid": "R0FsaFdqREFaUFp1c0MwbUpsbHVSZ200blBJZWJVMTUtNGsyVlBmdHk5UQ", "n": "2ilgsKVqF92KfhwmosSVeZOaDgb3RF1mbg-pqkmLO6YpOO06LF4V4angF-GhP-ysAm2E75aSIU4tnHVThFlcxTgKFqjYKJQXyVzTVK2r-L2IbvFPaDtvoU6WteybpMlIUVk2po3cFDGObCWYKCm7CUOLlwH0uOpui66P9VSCqdKVKbJRAQBvTSbP10KWPxulfqjWGJtHO5fY7-JVWwOBkG-eHSJIT_uaoPjyvKCZjknq04bLUV9qP78KRQpRyYijBN60w2v8F79baN9CN10TIEjjWKGz0uX0M_YYQzTUoSY5l5ka9RkL3wT4o2iQ1t5nHphX6aA-gqwgCQmi-nvjaw", "e": "AQAB"}]}
\ No newline at end of file
diff --git a/tests/test_14_read_only_list_file.py b/tests/test_14_read_only_list_file.py
index 4ad82986..33bdc5de 100644
--- a/tests/test_14_read_only_list_file.py
+++ b/tests/test_14_read_only_list_file.py
@@ -19,9 +19,7 @@ def test_read_only_list_file():
     assert len(_read_only) == 0
 
     with open(FILE_NAME, "w") as fp:
-        for item in ["one", "two", "three"]:
-            fp.write(item)
-            fp.write("\n")
+        fp.writelines(line + '\n' for line in ["one", "two", "three"])
 
     assert len(_read_only) == 3
     assert set(_read_only) == {"one", "two", "three"}