fix: stop crash when parsing empty files and strings

Signed-off-by: Donnie Adams <[email protected]>

gptscript/gptscript.py

@@ -97,12 +97,16 @@ def run(
     async def parse(self, file_path: str, disable_cache: bool = False) -> list[Text | Tool]:
         out = await self._run_basic_command("parse", {"file": file_path, "disableCache": disable_cache})
         parsed_nodes = json.loads(out)
+        if parsed_nodes is None or parsed_nodes.get("nodes", None) is None:
+            return []
         return [Text(**node["textNode"]) if "textNode" in node else Tool(**node.get("toolNode", {}).get("tool", {})) for
                 node in parsed_nodes.get("nodes", [])]
 
     async def parse_tool(self, tool_def: str) -> list[Text | Tool]:
         out = await self._run_basic_command("parse", {"content": tool_def})
         parsed_nodes = json.loads(out)
+        if parsed_nodes is None or parsed_nodes.get("nodes", None) is None:
+            return []
         return [Text(**node["textNode"]) if "textNode" in node else Tool(**node.get("toolNode", {}).get("tool", {})) for
                 node in parsed_nodes.get("nodes", [])]
 

tests/test_gptscript.py

@@ -259,6 +259,19 @@ async def test_parse_simple_file(gptscript):
         "Unexpected output from parsing simple file"
 
 
+@pytest.mark.asyncio
+async def test_parse_empty_file(gptscript):
+    wd = os.getcwd()
+    tools = await gptscript.parse(wd + "/tests//fixtures/empty.gpt")
+    assert len(tools) == 0, "Unexpected number of tools for parsing emtpy file"
+
+
+@pytest.mark.asyncio
+async def test_parse_empty_str(gptscript):
+    tools = await gptscript.parse_tool("")
+    assert len(tools) == 0, "Unexpected number of tools for parsing empty string"
+
+
 @pytest.mark.asyncio
 async def test_parse_tool_with_metadata(gptscript):
     wd = os.getcwd()