Ensure hasMore is updated when reconciling enum properties from parent

[nbruno]

Fixes #1429

Using the spec from the issue, Child now looks like:

{
  "model" : {
    "parent" : "Parent",
    "name" : "Child",
    "classname" : "Child",
    "classVarName" : "child",
    "modelJson" : "{\n  \"allOf\" : [ {\n    \"$ref\" : \"#/definitions/Parent\"\n  }, {\n    \"properties\" : {\n      \"childProp\" : {\n        \"type\" : \"string\"\n      }\n    }\n  } ]\n}",
    "vars" : [ {
      "baseName" : "id",
      "getter" : "getId",
      "setter" : "setId",
      "datatype" : "String",
      "datatypeWithEnum" : "String",
      "name" : "id",
      "defaultValue" : "null",
      "baseType" : "String",
      "jsonSchema" : "{\n  \"type\" : \"string\"\n}",
      "hasMore" : true,
      "isPrimitiveType" : true,
      "isNotContainer" : true,
      "isEnum" : false
    }, {
      "baseName" : "childProp",
      "getter" : "getChildProp",
      "setter" : "setChildProp",
      "datatype" : "String",
      "datatypeWithEnum" : "String",
      "name" : "childProp",
      "defaultValue" : "null",
      "baseType" : "String",
      "jsonSchema" : "{\n  \"type\" : \"string\"\n}",
      "hasMore" : true,
      "isPrimitiveType" : true,
      "isNotContainer" : true,
      "isEnum" : false
    }, {
      "baseName" : "error",
      "getter" : "getError",
      "setter" : "setError",
      "datatype" : "String",
      "datatypeWithEnum" : "String",
      "name" : "error",
      "defaultValue" : "null",
      "baseType" : "String",
      "jsonSchema" : "{\n  \"type\" : \"string\"\n}",
      "isPrimitiveType" : true,
      "isNotContainer" : true,
      "isEnum" : false
    } ],
    "imports" : [ "Parent" ],
    "hasVars" : true,
    "hasEnums" : true
  },
  "importPath" : "io.swagger.model.Child"
}

Notice the hasMore attribute on the error var is now gone.