Add import exception to Poetry import error message

Fixes #96

tox_poetry_installer/_poetry.py

@@ -37,7 +37,7 @@ try:
     from poetry.installation.operations.install import Install
     from poetry.poetry import Poetry
     from poetry.utils.env import VirtualEnv
-except ImportError:
+except ImportError as err:
     raise exceptions.PoetryNotInstalledError(
-        f"No version of Poetry could be imported under the current environment for '{sys.executable}'"
+        f"Failed to import a supported version of Poetry under the current environment '{sys.executable}': {err}"
     ) from None

tox_poetry_installer/utilities.py

@@ -46,9 +46,9 @@ def check_preconditions(venv: ToxVirtualEnv) -> "_poetry.Poetry":
     #
     # ``RuntimeError`` is dangerous to blindly catch because it can be (and in Poetry's case,
     # is) raised in many different places for different purposes.
-    except RuntimeError:
+    except RuntimeError as err:
         raise exceptions.SkipEnvironment(
-            "Project does not use Poetry for env management, skipping installation of locked dependencies"
+            f"Skipping installation of locked dependencies due to a Poetry error: {err}"
         ) from None