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+++ This bug was initially created as a clone of Bug #1086554 +++

Description of problem:
For Network Install VM, If you just input install url with "ftp://", the error message shows: "Unable to complete install: NoneType object has no attribute 'sendall'"

Version-Release number of selected component:
virt-manager-0.10.0-20.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1. Start virt-manager.

2. Create a new vm by "Network Install" until "step 2 of 5" on New VM window, just input a install URL with "ftp://"

3. Forward the New VM window util "Step 5 of 5" window, and click "Finish" button



Actual result:
1. Error message shows: "Unable to complete install: NoneType object has no attribute 'sendall'", and this error is not clear.


Expected results:
1. An error will be shown if you input install url with "http://", "Unable to complete install: Invalid install location: Opening URL http:// failed"


Additional info:
1. This issue does not occur with install url "http://" or "nfs:"
2. If set a wrong ftp url eg:ftp://test, the error info is also unclear:Unable to complete install: '[Errno -2] Name or service not known'
3. This issue also occurs on latest rhel6u5.

This issue also occurs on latest rhel6u5, 
Error info is not right and not clear when network install vm with url "ftp://",
so clone it.

it looks like a minor issue we can postpone to the next major release.