Added an empty list message to the Passes screen

app/src/main/res/values/strings.xml

@@ -47,7 +47,7 @@
 
     <string name="timer_zero" translatable="false">00:00:00</string>
 
-    <string name="passes_error">No upcoming passes</string>
+    <string name="passes_error">There are no upcoming satellite passes to display</string>
     <string name="passes_empty_db">No data to show. Please update the database via Settings menu.</string>
 
     <string name="pass_satName" translatable="false">%s</string>