fix: for pyenv spinning forever and crashes (#444)

Fixes #437 
Fixes #427

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: karthiknadig <3840081+karthiknadig@users.noreply.github.com>

Author: karthiknadig

src/managers/pyenv/main.ts

@@ -13,10 +13,14 @@ export async function registerPyenvFeatures(
     const api: PythonEnvironmentApi = await getPythonApi();
 
     try {
-        await getPyenv(nativeFinder);
-
-        const mgr = new PyEnvManager(nativeFinder, api);
-        disposables.push(mgr, api.registerEnvironmentManager(mgr));
+        const pyenv = await getPyenv(nativeFinder);
+        
+        if (pyenv) {
+            const mgr = new PyEnvManager(nativeFinder, api);
+            disposables.push(mgr, api.registerEnvironmentManager(mgr));
+        } else {
+            traceInfo('Pyenv not found, turning off pyenv features.');
+        }
     } catch (ex) {
         traceInfo('Pyenv not found, turning off pyenv features.', ex);
     }

src/managers/pyenv/pyenvUtils.ts

@@ -225,8 +225,11 @@ export async function refreshPyenv(
             .filter((e) => !isNativeEnvInfo(e))
             .map((e) => e as NativeEnvManagerInfo)
             .filter((e) => e.tool.toLowerCase() === 'pyenv');
-        pyenv = managers[0].executable;
-        await setPyenv(pyenv);
+        
+        if (managers.length > 0) {
+            pyenv = managers[0].executable;
+            await setPyenv(pyenv);
+        }
     }
 
     const envs = data