Hob: fix '!= None' and '== None' in the code

This patch is to fix the following:

if foo != None -----> if foo
if foo == None -----> if not foo

(From Poky rev: d771343b1726f166ed8d75543ba68bd2a20aee7b)

(Bitbake rev: 23c140a4d00293d922cbd34b6b837493cac2e93a)

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/crumbs/hobeventhandler.py

@@ -119,7 +119,7 @@ class HobHandler(gobject.GObject):
             self.generating = False
 
     def run_next_command(self, initcmd=None):
-        if initcmd != None:
+        if initcmd:
             self.initcmd = initcmd
 
         if self.commands_async:
@@ -127,7 +127,7 @@ class HobHandler(gobject.GObject):
             next_command = self.commands_async.pop(0)
         else:
             self.clear_busy()
-            if self.initcmd != None:
+            if self.initcmd:
                 self.emit("command-succeeded", self.initcmd)
             return