Giving proper workspace description when the launcher is not loaded.

Bug: 27326504
Change-Id: Ifc30221f756d75064a4baf5f3bfc71b8f590b4b1
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index f04244f..4aea85e 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -4255,6 +4255,10 @@
             }
             nScreens--;
         }
+        if (nScreens == 0) {
+            // When the workspace is not loaded, we do not know how many screen will be bound.
+            return getContext().getString(R.string.all_apps_home_button_label);
+        }
         return getContext().getString(R.string.workspace_scroll_format,
                 page + 1 - delta, nScreens);
     }