wait for a dashboard card to load (#1556)

airgun/entities/dashboard.py

@@ -1,3 +1,5 @@
+import time
+
 from airgun.entities.base import BaseEntity
 from airgun.navigation import NavigateStep, navigator
 from airgun.utils import retry_navigation
@@ -17,6 +19,7 @@ def read(self, widget_name):
         view = self.navigate_to(self, 'All')
         if widget_name not in view.widget_names:
             raise ValueError('Provide correct widget name to be read')
+        time.sleep(3)
         return getattr(view, widget_name).read()
 
     def read_all(self):