ari endpoints: GET /ari/endpoints/{invalid-tech} should return a 404

Implementation listing endpoints by technology returned an empty array if no
matching endpoints were found.  Fixed so a "404 Not Found" will be returned
instead.

(closes issue ASTERISK-22803)
Reported by: David M. Lee


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@402787 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api/api-docs/endpoints.json

@@ -35,6 +35,12 @@
 							"paramType": "path",
 							"dataType": "string"
 						}
+					],
+					"errorResponses": [
+						{
+							"code": 404,
+							"reason": "Endpoints not found"
+						}
 					]
 				}
 			]
@@ -61,6 +67,12 @@
 							"paramType": "path",
 							"dataType": "string"
 						}
+					],
+					"errorResponses": [
+						{
+							"code": 404,
+							"reason": "Endpoints not found"
+						}
 					]
 				}
 			]