Fix Check for _cookieJar in HTTPClient (#6266) (#6280)

* Check for cookieJar before setting cookies

* Return as soon as possible w/o _cookieJar

libraries/HTTPClient/src/HTTPClient.cpp

@@ -1543,6 +1543,10 @@ void HTTPClient::clearAllCookies()
 
 void HTTPClient::setCookie(String date, String headerValue)
 {
+    if (!_cookieJar)
+    {
+        return;
+    }
     #define HTTP_TIME_PATTERN "%a, %d %b %Y %H:%M:%S"
 
     Cookie cookie;
@@ -1670,6 +1674,10 @@ bool HTTPClient::generateCookieString(String *cookieString)
     *cookieString = "";
     bool found = false;
 
+    if (!_cookieJar)
+    {
+        return false;
+    }
  	for (auto c = _cookieJar->begin(); c != _cookieJar->end(); ++c) {
         if ((c->max_age.valid && ((c->date + c->max_age.duration) < now_gmt)) || (!c->max_age.valid && c->expires.valid && c->expires.date < now_gmt)) {
             _cookieJar->erase(c);
@@ -1682,5 +1690,6 @@ bool HTTPClient::generateCookieString(String *cookieString)
             found = true;
         }
     }
+    
     return found;
 }