Don't delete legacy shortcuts in loadWorkspace()

Legacy 1x1 shortcut intents have null package names.
This was causing an NPE when calling LauncherApps#getApplicationInfo(),
which caused those shortcuts to be removed from the workspace.

Bug: 37634887
Change-Id: I6d9876ee1634a573c1f0f94602ae373365cab01c

src/com/android/launcher3/LauncherModel.java

@@ -1062,7 +1062,8 @@ public class LauncherModel extends BroadcastReceiver
                                     info = c.loadSimpleShortcut();
 
                                     // Shortcuts are only available on the primary profile
-                                    if (pmHelper.isAppSuspended(targetPkg, c.user)) {
+                                    if (!TextUtils.isEmpty(targetPkg)
+                                            && pmHelper.isAppSuspended(targetPkg, c.user)) {
                                         disabledState |= ShortcutInfo.FLAG_DISABLED_SUSPENDED;
                                     }