is collectException working for every exceptions ?

[Roman Sztergbaum]

Hello as the subject say i'm asking this question because with 
the following code

```
private config_create_answer create_config(string[] args)
     in
     {
         assert(args !is null, "args cannot be null");
         assert(args.length == 2, "need 1 arguments");
     }
     out (r)
     {
         assert(r.state == "SUCCESS", "create_config should 
success");
         assert(!r.config_key.empty, "config_key should not be 
empty");
         assert(!r.readonly_config_key.empty, "readonly_config_key 
should not be empty");
     }
     body
     {
         string config_name;
         getopt(args, "name", &config_name);
         auto cfg = (cast(const 
char[])(std.file.read("../API_doc/json_recipes/config_create.json")))
             .deserialize!config_create;
         cfg.config_name = config_name.strip("\"");
         client_.socket.send(cfg.serializeToJson);
         auto answer = new ubyte[256];
         client_.socket.receive(answer);
         client_.socket.getErrorText.writeln;
         return (cast(string) 
answer).deserialize!config_create_answer;
     }

     unittest
     {
         import std.exception : collectException;

         auto cli = new CLI("/tmp/raven-os_service_albinos.sock");
         assert(cli.create_config(["create_config", "--name=toto"])
                 .state == "SUCCESS", "should be success");
         assert(cli.create_config(["create_config", 
"--name=\"titi\""])
                 .state == "SUCCESS", "should be success");
         
assert(collectException(cli.create_config(["create_config", 
"--name="]))); //here is my problem
     }
```

i would like to specify `collectException!GetOptException`, but 
it's seem's make the program exit with fail status.

any idea what i'm doing wrong ?

also it's my first d program, so if anything seem's bad let me 
know