Description of problem:

While generating the "Host - compare content hosts packages" report template, It is required to put Host 1* and Host 2* names to compare the packages. However if mistakenly mention the same hostname in both the Host1* and Host2* fields, it allows submitting the request but the error is misleading i.e

Error -
At least one of the hosts couldn't be found

Version-Release number of selected component (if applicable):
Satellite 6.13

How reproducible:
Always

Steps to Reproduce:
1. Login to the Satellite 6.13 WebUI
2. Register a client with the satellite e.g "client.example.com"
3. Generate a "Host - compare content hosts packages" report template as follows:

Monitor > Report Templates > "Host - compare content hosts packages" > Click on Generate

a) Now fill up the field Generate at (Select the date/time)
b) Choose Output format (CVS)
c) Put the Host1* and Host2* value same as "client.example.com"

Actual results:

Error -
At least one of the hosts couldn't be found

Expected results:

It should notify or validate the hostname before hitting on submit it. Else can change the misleading error that the host1 and host2 names are the same.