allow installed AppImage apps to launch without URL

src/main/index.ts

@@ -760,7 +760,7 @@ function createWindow(): void {
 
   ipcMain.on('launch-app', (_, payload: {
     appName: string
-    url: string
+    url?: string
     width?: number
     height?: number
     devAppPath?: string
@@ -815,17 +815,18 @@ function createWindow(): void {
         : resolvedExecPath
     if (spawnPath) {
       const useDevLauncher = is.dev && spawnPath === resolvedDevAppPath
+      const launchUrlArg = url ? [`--url=${encodeURIComponent(url)}`] : []
       const args = useDevLauncher
         ? ['run', 'dev']
-        : [`--url=${encodeURIComponent(url)}`, ...authLaunchArgs, ...(authProtocolUrl ? [authProtocolUrl] : [])]
+        : [...launchUrlArg, ...authLaunchArgs, ...(authProtocolUrl ? [authProtocolUrl] : [])]
       const execBin = useDevLauncher ? 'npm' : spawnPath
 
       const childEnv = { ...process.env }
-      if (useDevLauncher) {
+      if (useDevLauncher && url) {
         childEnv.ATNMY_APP_URL = url
       }
       if (useDevLauncher && handoffCode) {
-        childEnv.ATNMY_HANDOFF_FILE = writeDevHandoffFile(appName, url, handoffCode, audienceApp)
+        childEnv.ATNMY_HANDOFF_FILE = writeDevHandoffFile(appName, url ?? '', handoffCode, audienceApp)
         childEnv.ATNMY_HANDOFF_TOKEN = handoffCode
         childEnv.ATNMY_AUDIENCE_APP = audienceApp
       } else if (handoffCode) {
@@ -885,7 +886,7 @@ function createWindow(): void {
         additionalArguments: [
           '--app-window',
           `--app-name=${encodeURIComponent(appName)}`,
-          `--app-url=${encodeURIComponent(url)}`
+          `--app-url=${encodeURIComponent(url ?? '')}`
         ]
       }
     })