add test for empty data

Author: ondrajodas

tests/functional/download-empty-data/expected/data/out/files/.gitkeep

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+"properties/403517979","Website - GA4","accounts/128209249","Keboola Website"

tests/functional/download-empty-data/expected/data/out/tables/properties.csv

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+{"destination":"in.c-keboola-ex-google-analytics-v4-01k6mq8atddf0xbr48p2b9st4h.properties","incremental":true,"columns":["propertyKey","propertyName","accountKey","accountName"],"primary_key":["propertyKey"],"column_metadata":{"propertyKey":[{"key":"KBC.datatype.nullable","value":true},{"key":"KBC.datatype.basetype","value":"STRING"}],"propertyName":[{"key":"KBC.datatype.nullable","value":true},{"key":"KBC.datatype.basetype","value":"STRING"}],"accountKey":[{"key":"KBC.datatype.nullable","value":true},{"key":"KBC.datatype.basetype","value":"STRING"}],"accountName":[{"key":"KBC.datatype.nullable","value":true},{"key":"KBC.datatype.basetype","value":"STRING"}]}}

tests/functional/download-empty-data/expected/data/out/tables/properties.csv.manifest

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+[{"metric":"API Calls","value":1}]

tests/functional/download-empty-data/expected/data/out/usage.json

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+{
+  "authorization": {
+    "oauth_api": {
+      "credentials": {
+        "appKey": "%env(string:CLIENT_ID)%",
+        "#appSecret": "%env(string:CLIENT_SECRET)%",
+        "#data": "%env(string:CREDENTIALS_DATA)%"
+      }
+    }
+  },
+  "parameters": {
+    "outputTable": "empty-data",
+    "query": {
+      "metrics": [
+        {
+          "name": "active1DayUsers"
+        },
+        {
+          "name": "active28DayUsers"
+        }
+      ],
+      "dimensions": [
+        {
+          "name": "campaignId"
+        },
+        {
+          "name": "campaignName"
+        },
+        {
+          "name": "city"
+        },
+        {
+          "name": "cityId"
+        }
+      ],
+      "dateRanges": [
+        {
+          "startDate": "2015-08-14",
+          "endDate": "2015-08-15"
+        }
+      ]
+    },
+    "endpoint": "data-api",
+    "outputBucket": "in.c-keboola-ex-google-analytics-v4-01k6mq8atddf0xbr48p2b9st4h",
+    "properties": [
+      {
+        "accountKey": "accounts/128209249",
+        "accountName": "Keboola Website",
+        "propertyKey": "properties/403517979",
+        "propertyName": "Website - GA4"
+      }
+    ]
+  }
+}