Fix regression when deps=False is set

CHANGELOG.md

@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   (the ones that starts with `../` or `./`)
   [#174](https://github.com/pyodide/micropip/pull/174)
 
+- Fixed an error when calling `micropip.install` with `deps=False` is set.
+  [#187](https://github.com/pyodide/micropip/pull/187)
+
 ### Added
 
 - `micropip` now vendors `pypa/packaging` for better reliability.

micropip/transaction.py

@@ -268,6 +268,8 @@
             else:
                 await wheel_download_task
                 await self.gather_requirements(wheel.requires(extras))
+        else:
+            await wheel_download_task
 
         self.wheels.append(wheel)
 

tests/integration/test_integration.py

@@ -33,6 +33,25 @@ async def _run(selenium):
     _run(selenium_standalone_micropip)
 
 
+@integration_test_only
+def test_integration_install_no_deps(selenium_standalone_micropip, pytestconfig):
+    @run_in_pyodide
+    async def _run(selenium):
+        import micropip
+
+        await micropip.install("pyodide-micropip-test", deps=False)
+
+        try:
+            # pyodide-micropip-test depends on snowballstemmer
+            import snowballstemmer  # noqa: F401
+        except ModuleNotFoundError:
+            pass
+        else:
+            raise Exception("Should raise!")
+
+    _run(selenium_standalone_micropip)
+
+
 @integration_test_only
 def test_integration_list_basic(selenium_standalone_micropip, pytestconfig):
     @run_in_pyodide