Catch uninstall plugin

backend/browser.py

@@ -65,7 +65,10 @@ class PluginBrowser:
         return web.Response(text="Requested plugin uninstall")
 
     async def _install(self, artifact, name, version, hash):
-        await self.uninstall_plugin(name)
+        try: 
+            await self.uninstall_plugin(name)
+        except:
+            self.log.error(f"Plugin {name} not installed, skipping uninstallation")
         self.log.info(f"Installing {name} (Version: {version})")
         async with ClientSession() as client:
             self.log.debug(f"Fetching {artifact}")