Decrease Cyclomatic Complexity

Author: toupper

plugins/woocommerce/src/main/kotlin/org/wordpress/android/fluxc/network/rest/wpcom/wc/product/ProductRestClient.kt

@@ -654,13 +654,20 @@ class ProductRestClient @Inject constructor(
             }
         }
 
-        if (globalUniqueIdSearchQuery.isNullOrEmpty().not()) {
-            params["global_unique_id"] = globalUniqueIdSearchQuery!!
-        }
+        addGlobalUniqueIdSearchQuery(params, globalUniqueIdSearchQuery)
 
         return params
     }
 
+    private fun addGlobalUniqueIdSearchQuery(
+        params: MutableMap<String, String>,
+        globalUniqueIdSearchQuery: String?
+    ) {
+        if (!globalUniqueIdSearchQuery.isNullOrEmpty()) {
+            params["global_unique_id"] = globalUniqueIdSearchQuery
+        }
+    }
+
     /**
      * Makes a GET request to `/wp-json/wc/v3/products/categories` retrieving a list of product
      * categories for the given WooCommerce [SiteModel].