Created attachment 1162623 [details]
Logs

Description of problem:
[REST-API] - Creating bond with network attached via rest leaving the setup networks dialog in unrecoverable state.

When creating bond with network attached via rest api and passing only ip_address_assignments without ipv6 or vise versa, it will leave the setup networks dialog(ui) in unrecoverable state. It isn't possible to detach the network, to break the bond or to edit it. UI filled with exceptions. 

When passing the request without the ip_address_assignments and without ipv6, everything working ok. 

Version-Release number of selected component (if applicable):
4.1.0-0.0.master.20160528231304.git9350259.el7.centos

How reproducible:
100

Steps to Reproduce:
1. Create bond with network attached via rest --> 
POST -

<action>
    <async>false</async>
    <grace_period>
        <expiry>10</expiry>
    </grace_period>
    <modified_network_attachments>
        <network_attachment>
         <network>
           <name>n-3</name>
           <link rel="permissions"/> 
           <link rel="vnicprofiles"/>
           <link rel="labels"/>
           <data_center id="1559aee8-d294-4299-a733-8ff08a29feec"/>
           <stp>false</stp>
            <mtu>0</mtu>
             <usages>
                <usage>vm</usage>
           </usages>
         </network>
            <host_nic>
                <name>bond10</name>
            </host_nic>
            <ip_address_assignments>
                <ip_address_assignment>
                    <ip/>
                    <assignment_method>none</assignment_method>
                </ip_address_assignment>
            </ip_address_assignments>
        </network_attachment>
    </modified_network_attachments>
    <removed_network_attachments/>
    <synchronized_network_attachments/>
    <modified_bonds>
        <host_nic> 
    <name>bond10</name> 
      <bonding>
        <slaves>
            <host_nic id="7218509b-39d1-4b3a-ba8f-955b0aae4b9e"/>
            <host_nic id="22caa77f-9dd2-401e-adee-624c0634ec55"/>
        </slaves>
     </bonding>
    </host_nic>
   </modified_bonds>
  <removed_bonds/>
    <modified_labels/>
    <removed_labels/>
    <check_connectivity>true</check_connectivity>
    <connectivity_timeout>60</connectivity_timeout>
  </action>


2. Go to setup networks dialog in the engine UI and try to break the bond, try to edit network, try to detach network. 

Actual results:
Can't do anything with this bond and the network that is attached to him.
UI filled with UI exceptions:

Uncaught exception occurred. Please try reloading the page. Details: Exception caught: (TypeError) __gwt$exception: <skipped>: Cannot read property 'c' of null
Please have your administrator check the UI logs

Uncaught exception occurred. Please try reloading the page. Details: IpConfiguration does not have IPv6 address set.
Please have your administrator check the UI logs

Uncaught exception occurred. Please try reloading the page. Details: Exception caught: IpConfiguration does not have IPv6 address set.
Please have your administrator check the UI logs

-The workaround is to delete the network attachment via rest.

Expected results:
Should work and handle requests with ip attachments and without

Additional info -->
The bond is created with warning icon and tooltip that explaining that the bond created in mode 4, but have no partner mac. Need to understand if it's caused by this bug.