bitbake: toaster: Improve client side error handling

Make use of the toastermain.settings.DEBUG flag to toggle the client
side error logging. Make the error logging consistent by using
console.warn/error across the project, this adds traceability to the
warnings. Also handles the case where console is not available by
stubbing it in libtoaster.

(Bitbake rev: c34ebc51a6cbf90c64ef1ac461e475c6341f0f2a)

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/templates/base.html

@@ -21,6 +21,11 @@
 </script>
 <script src="{% static 'js/libtoaster.js' %}">
 </script>
+{% if DEBUG %}
+<script>
+  libtoaster.debug = true;
+ </script>
+{% endif %}
 <script src="{% static 'js/base.js' %}"></script>
 {%if MANAGED %}
 <script>