fix(spec): ignore empty string for multi-value parameter (#9511)

Refs #9266 
Refs #5176 

Co-authored-by: Julien Bourges <julien.bourges@actility.com>
Co-authored-by: Oliwia Rogala <oliwia.rogala@smartbear.com>

src/core/plugins/spec/selectors.js

@@ -374,6 +374,9 @@ export function parameterValues(state, pathMethod, isXml) {
   let paramValues = operationWithMeta(state, ...pathMethod).get("parameters", List())
   return paramValues.reduce( (hash, p) => {
     let value = isXml && p.get("in") === "body" ? p.get("value_xml") : p.get("value")
+    if (List.isList(value)) {
+      value = value.filter(v => v !== "")
+    }
     return hash.set(paramToIdentifier(p, { allowHashes: false }), value)
   }, fromJS({}))
 }

test/unit/core/plugins/spec/selectors.js

@@ -108,7 +108,9 @@ describe("parameterValue", function(){
             get: {
               parameters: [
                 { name: "one", in: "query", value: 1},
-                { name: "two", in: "query", value: "duos"}
+                { name: "two", in: "query", value: "duos"},
+                { name: "three", in: "query", value: ["v1","","v2"]},
+                { name: "four", in: "query", value: [""]}
               ]
             }
           }
@@ -122,7 +124,9 @@ describe("parameterValue", function(){
     // Then
     expect(paramValues.toJS()).toEqual({
       "query.one": 1,
-      "query.two": "duos"
+      "query.two": "duos",
+      "query.three": ["v1","v2"],
+      "query.four": []
     })
 
   })