Fix crash in single_app.ipynb from invalid version

This is the same issue that I recently solved in
the aiidalab and aiidalab-registry packages,
see aiidalab/aiidaslab#339 and aiidalab/aiidalab-registry#103 for details.

It did not occur to me that the same issue
occurs here right in our AiiDAlab home!

aiidalab

@@ -0,0 +1 @@
+/home/jovyan/local/aiidalab/aiidalab

home/app_manager.py

@@ -4,11 +4,11 @@
 
 import ipywidgets as ipw
 import traitlets
-from aiidalab.app import AppRemoteUpdateStatus as AppStatus
-from aiidalab.app import AppVersion
 from jinja2 import Template
-from packaging.version import parse
+from packaging.version import InvalidVersion, parse
 
+from aiidalab.app import AppRemoteUpdateStatus as AppStatus
+from aiidalab.app import AppVersion
 from home.utils import load_logo
 from home.widgets import LogOutputWidget, Spinner, StatusHTML
 
@@ -258,11 +258,14 @@ def _refresh_prereleases(self, change):
         installed_version = app.installed_version
 
         has_prereleases = app.has_prereleases
-        prerelease_installed = (
-            parse(installed_version).is_prerelease
-            if isinstance(installed_version, str)
-            else False
-        )
+        prerelease_installed = False
+        if isinstance(installed_version, str):
+            try:
+                parsed_version = parse(installed_version)
+            except InvalidVersion:
+                pass
+            else:
+                prerelease_installed = parsed_version.is_prerelease
 
         with self.hold_trait_notifications():
             # The checkbox can only be enabled when the app has prereleases,

segfault.py

@@ -0,0 +1,3 @@
+from home.app_store import AiidaLabAppStore
+
+store = AiidaLabAppStore()

single_app.ipynb

@@ -75,14 +75,7 @@
    "source": [
     "app_base = AiidaLabApp(name, app_data, AIIDALAB_APPS)\n",
     "\n",
-    "try:\n",
-    "    display(AppManagerWidget(app_base, minimalistic=False))\n",
-    "except Exception as error:  # pylint: disable=broad-except\n",
-    "    display(ipw.HTML(\n",
-    "        '<div style=\"font-size: 30px; text-align:center;\">'\n",
-    "        f'Unable to show app widget due to error: {error}'\n",
-    "        '</div>',\n",
-    "        layout={'width': '600px'}))"
+    "display(AppManagerWidget(app_base, minimalistic=False))"
    ]
   }
  ],