Handle a blank endpoint or parameter description without crashing

src/ferry_cli/helpers/ferry_parser.py

@@ -62,7 +62,7 @@ def parse_description(
         name: str = "Endpoint", method: str = "", description: str = ""
     ) -> str:
         description_lines = textwrap.wrap(description, width=60)
-        first_line = description_lines[0]
+        first_line = description_lines[0] if description_lines else ""
         rest_lines = description_lines[1:]
         endpoint_description = name.replace("/", "")
 

tests/test_ferry_parser.py

@@ -0,0 +1,31 @@
+import pytest
+
+from ferry_cli.helpers.ferry_parser import FerryParser
+
+
+@pytest.mark.parametrize("description", ["", "   ", "\n\t "])
+def test_parse_description_blank(description):
+    """A blank description should not abort endpoint generation."""
+    result = FerryParser.parse_description(
+        name="testEndpoint", method="GET", description=description
+    )
+    assert "testEndpoint" in result
+    assert "(GET)" in result
+
+
+def test_parse_description_wraps_long_text():
+    description = "word " * 40
+    result = FerryParser.parse_description(
+        name="testEndpoint", method="GET", description=description
+    )
+    assert len(result.splitlines()) > 1
+
+
+def test_set_arguments_with_blank_param_description():
+    """Swagger parameters sometimes carry an empty description."""
+    parser = FerryParser.create(description="test")
+    parser.set_arguments(
+        [{"name": "unitname", "type": "string", "required": False, "description": ""}]
+    )
+    args = parser.parse_args(["--unitname", "testunit"])
+    assert args.unitname == "testunit"