Fix reconnecting on request error

src/datasource-zabbix/utils.ts

@@ -302,6 +302,9 @@ export function callOnce(func, promiseKeeper) {
         .then(result => {
           promiseKeeper = null;
           return result;
+        }).catch(err => {
+          promiseKeeper = null;
+          throw err;
         })
       );
     }

src/datasource-zabbix/zabbix/proxy/cachingProxy.ts

@@ -65,6 +65,9 @@ function callOnce(func, promiseKeeper, funcScope) {
         .then(result => {
           promiseKeeper[hash] = null;
           return result;
+        }).catch(err => {
+          promiseKeeper[hash] = null;
+          throw err;
         })
       );
     }