Ingress router crashing while creaing route with edge termination by providing cert's key value empty in ocp4.x

1. Proposed title of this feature request

 Avoid crashing ingress router while creating an application route with  edge termination by providing the cert 's key value empty. 

• command syntax:

#oc create route edge --service=frontend \
--cert=${MASTER_CONFIG_DIR}/ca.crt \
--key=${MASTER_CONFIG_DIR}/ca.key \  <==== this was not provided
--ca-cert=${MASTER_CONFIG_DIR}/ca.crt \
--hostname=www.example.com

 Error logs:
router-logs]$ cat router-default-f9b4d8746-ft4w6.log
cat router-default-f9b4d8746-dzmnj.log

~~~
I0806 01:52:48.217477 1 router.go:548] template "level"=0 "msg"="router reloaded" "output"=" - Checking http:
//localhost:80 ...\n - Health check ok : 0 retry attempt(s).\n"
E0806 01:56:51.921968 1 limiter.go:140] error reloading router: waitid: no child processes

• Checking
  http://localhost:80
  ...
• Health check ok : 0 retry attempt(s).

E0810 17:45:29.363640 1 limiter.go:140] error reloading router: exit status 1
[ALERT] 222/174529 (30533) : parsing [/var/lib/haproxy/conf/haproxy.config:117] : 'bind
127.0.0.1
:10444' : 'crt-list
' : error processing line 1 in file '/var/lib/haproxy/conf/cert_config.map' : unable to load SSL certificate file '/
var/lib/haproxy/router/certs/http-echo:bad-route.pem' file does not exist.
[ALERT] 222/174529 (30533) : Error(s) found in configuration file : /var/lib/haproxy/conf/haproxy.config
[ALERT] 222/174529 (30533) : Fatal errors found in configuration.
E0810 17:46:12.820382 1 limiter.go:140] error reloading router: exit status 1
[ALERT] 222/174612 (30536) : parsing [/var/lib/haproxy/conf/haproxy.config:117] : 'bind
127.0.0.1
:10444' : 'crt-list
' : error processing line 1 in file '/var/lib/haproxy/conf/cert_config.map' : unable to load SSL certificate file '/
var/lib/haproxy/router/certs/http-echo:bad-route.pem' file does not exist.
[ALERT] 224/122351 (30899) : Error(s) found in configuration file : /var/lib/haproxy/conf/haproxy.config
[ALERT] 224/122351 (30899) : Fatal errors found in configuration.
~~~
 

2. Why does the customer need this? (List the business requirements here)

Customer said:

~~~
As a platform operator, administrators are aware not to provide an empty key. However, many end-users do not understand the required fields. one end user is able to break the haproxy for all users of the platform.

~~~

Customer's concern is to prevent breaking the router even if the supplied key value is missing.