bitbake: knotty: make it possible to use termfilter without either console

This isn't useful for knotty itself, but for use from tinfoil
in case we can't get access to either the console or errconsole, allow
either to be unspecified (None).

(Bitbake rev: 7544de437fc66b81502ecdb5db859182c45827cb)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/knotty.py

@@ -207,8 +207,10 @@ class TerminalFilter(object):
             self.interactive = False
             bb.note("Unable to use interactive mode for this terminal, using fallback")
             return
-        console.addFilter(InteractConsoleLogFilter(self, format))
-        errconsole.addFilter(InteractConsoleLogFilter(self, format))
+        if console:
+            console.addFilter(InteractConsoleLogFilter(self, format))
+        if errconsole:
+            errconsole.addFilter(InteractConsoleLogFilter(self, format))
 
         self.main_progress = None