feat: add message for empty start and end date

apiary.apib

@@ -7276,6 +7276,20 @@ curl \
         "4265b702-9a69-38ca-bb45-bcad9ee7d910",2024-01-14T23:06:58Z,en,"api/v1/checking/scorecards/4265b702-9a69-38ca-bb45-bcad9ee7d910","9d38800b-89ae-396c-ae11-1de419f13a8f",Yak-1,,Yak-1,,35,red,20,1119,47,"Essentials English 2","2bd7dbcb-5510-4cdf-b054-0f275d3047c2",,,"96e79a50-97f9-3721-a755-0e9616c26a0b","AbcFull XyzName",webchecker,v1,"f5b8573c-e603-46d7-8af0-512d199d478b",check,developers,junior,draft,57,6,76,40,19,45,42,3,2,8,2,5,5,3
         "0521406f-ccf1-3acf-904a-7452766df8d7",2024-01-15T05:34:06Z,en,"api/v1/checking/scorecards/0521406f-ccf1-3acf-904a-7452766df8d7","77ad4993-80f1-31ec-9aef-1a33d2021a86",Su-22,,Su-22,,52,yellow,20,504,41,"Essentials English 2","2bd7dbcb-5510-4cdf-b054-0f275d3047c2","710eed98-732b-3668-8a67-f4294d9a7ff4",Wade,"96e79a50-97f9-3721-a755-0e9616c26a0b","AbcFull XyzName",webchecker,v1,"f5b8573c-e603-46d7-8af0-512d199d478b",check,developers,senior,draft,15,64,84,42,43,30,85,4,2,6,6,3,0,9
 
++ Response 400 (application/json)
+
+        {
+            "code": 400,
+            "message": "Provide a start date."
+        } 
+
++ Response 400 (application/json)
+
+        {
+            "code": 400,
+            "message": "Provide an end date."
+        }
+
 + Response 400 (application/json)
 
         {
@@ -7439,6 +7453,20 @@ curl \
         "4bbdc491-6821-3b53-8881-001553987b69",2023-10-29,"hello woorld",woorld,sentence,"en_CONSISTENCY_Guideline_id-9","CONSISTENCY guideline id 9 display name",en,syntax
         "4bbdc491-6821-3b53-8881-001553987b69",2023-10-29,"hello woorld",woorld,sentence,"en_CONSISTENCY_Guideline_id-2","CONSISTENCY guideline id 2 display name",en,syntax
 
++ Response 400 (application/json)
+
+        {
+            "code": 400,
+            "message": "Provide a start date."
+        } 
+
++ Response 400 (application/json)
+
+        {
+            "code": 400,
+            "message": "Provide an end date."
+        }
+
 + Response 400 (application/json)
 
         {