Fix workdir logic in RunCommandService

This commit fixes the workdir logic to not send `EXTRA_CURRENT_WORKING_DIRECTORY` extra to `TermuxService` if workdir is empty, since that will raise `No such file or directory` exceptions if `cwd` is empty when targeting sdk `29`.

app/src/main/java/com/termux/app/RunCommandService.java

@@ -104,14 +104,18 @@ public int onStartCommand(Intent intent, int flags, int startId) {
             return Service.START_NOT_STICKY;
         }
 
-         Uri programUri = new Uri.Builder().scheme("com.termux.file").path(getExpandedTermuxPath(intent.getStringExtra(RUN_COMMAND_PATH))).build();
+        Uri programUri = new Uri.Builder().scheme("com.termux.file").path(getExpandedTermuxPath(intent.getStringExtra(RUN_COMMAND_PATH))).build();
 
         Intent execIntent = new Intent(TermuxService.ACTION_EXECUTE, programUri);
         execIntent.setClass(this, TermuxService.class);
         execIntent.putExtra(TermuxService.EXTRA_ARGUMENTS, intent.getStringArrayExtra(RUN_COMMAND_ARGUMENTS));
-        execIntent.putExtra(TermuxService.EXTRA_CURRENT_WORKING_DIRECTORY, getExpandedTermuxPath(intent.getStringExtra(RUN_COMMAND_WORKDIR)));
         execIntent.putExtra(TermuxService.EXTRA_EXECUTE_IN_BACKGROUND, intent.getBooleanExtra(RUN_COMMAND_BACKGROUND, false));
 
+        String workingDirectory = intent.getStringExtra(RUN_COMMAND_WORKDIR);
+        if (workingDirectory != null && !workingDirectory.isEmpty()) {
+            execIntent.putExtra(TermuxService.EXTRA_CURRENT_WORKING_DIRECTORY, getExpandedTermuxPath(workingDirectory));
+        }
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             this.startForegroundService(execIntent);
         } else {