Fixed XML generated for kernel/initrd installs of KVM

Author: berrange

virtinst/DistroManager.py

@@ -692,7 +692,7 @@ def _get_osblob(self, install, hvm, arch = None, loader = None):
             else:
                 osblob += "    <type>%s</type>\n" % type
 
-            if self.install["kernel"]:
+            if install and self.install["kernel"]:
                 osblob += "    <kernel>%s</kernel>\n"   % self.install["kernel"]
                 osblob += "    <initrd>%s</initrd>\n"   % self.install["initrd"]
                 osblob += "    <cmdline>%s</cmdline>\n" % self.install["extraargs"]