Set installed traitlets of pseudo/qe install widget when it's done (#262

)

After PR #251 there is an issue that `SSSPInstallWidget` can not update the state to installed even if the pseudo libraries are properly installed.
The reason is that SSSPInstallWidget once updates the installed traitlets in `_refresh_installed` but not in the new implementation.
The way to fix this is to set the `installed` state if function `install()` finished okay.

aiidalab_qe/setup_codes.py

@@ -212,13 +212,12 @@ def _refresh_installed(self):
             for msg in install():
                 self.set_message(msg)
 
-            self.installed = True
-
         except Exception as error:
             self.set_message("Failed to setup QE on localhost.")
             self.set_trait("error", str(error))
             FN_DO_NOT_SETUP.touch()
         else:
+            self.set_trait("installed", True)
             self.set_message("OK")
         finally:
             self.set_trait("busy", False)

aiidalab_qe/sssp.py

@@ -102,6 +102,8 @@ def _refresh_installed(self):
             self.set_trait("error", str(error))
             self.set_message(str(error))
         else:
+            # If all the libraries are install by hands `pseudos_to_install()` will be empty list.
+            self.set_trait("installed", not bool(pseudos_to_install()))
             self.set_message("OK")
         finally:
             self.set_trait("busy", False)