show packages for detected sdk, fixed NPE if no interpreter selected

python/ide/src/com/jetbrains/python/configuration/PyActiveSdkConfigurable.java

@@ -145,7 +145,7 @@ public class PyActiveSdkConfigurable implements UnnamedConfigurable {
           dialog.show();
           return;
         }
-        if (!PySdkListCellRenderer.SEPARATOR.equals(item.toString()))
+        if (!PySdkListCellRenderer.SEPARATOR.equals(item))
           super.setSelectedItem(item);
       }
     };

python/src/com/jetbrains/python/sdk/PyDetectedSdk.java

@@ -6,6 +6,7 @@ import com.intellij.openapi.projectRoots.impl.ProjectJdkImpl;
 public class PyDetectedSdk extends ProjectJdkImpl {
   public PyDetectedSdk(String name, SdkTypeId sdkType) {
     super(name, sdkType);
+    setHomePath(name);
   }
 
 }