Merge pull request #158 from hotwired/mb/crash_fixes

Fix crash when accessing currentDestination

Author: mbarta

navigation-fragments/src/main/java/dev/hotwire/navigation/navigator/Navigator.kt

@@ -43,7 +43,11 @@ class Navigator(
      */
     val currentDestination: HotwireDestination?
         get() = currentDialogDestination as? HotwireDestination
-            ?: host.childFragmentManager.primaryNavigationFragment as? HotwireDestination
+            ?: if (isReady()) {
+                host.childFragmentManager.primaryNavigationFragment as? HotwireDestination
+            } else {
+                null
+            }
 
     /**
      * Gets the location for the current destination.