bitbake: toaster: catch IndexError error in dictionary lookups

In the get_dict_value filter, there is the edge case where halted
builds can lead to IndexError errors in dictionary lookups, so we
need to catch those.

[YOCTO #6067]

(Bitbake rev: f6fcce974ce3b145bc472cd4e9721d56191828a4)

Signed-off-by: David Reyna <David.Reyna@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/templatetags/projecttags.py

@@ -247,5 +247,5 @@ def get_dict_value(dictionary, key):
     """
     try:
         return dictionary[key]
-    except KeyError:
+    except (KeyError, IndexError):
         return ''