remove error message when accessing unused NVS key, update arduinojson version

Author: MartinVerges

library.json

@@ -1,6 +1,6 @@
 {
   "name": "ESP32 Wifi Manager",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "description": "A multi wifi manager for arduino based ESP applications, with extensive RESTful API, and configuration stored on non volatile memory.",
   "keywords": "esp32, wifi, ap, softap, sta, restful, api, manager, arduino",
   "repository":
@@ -18,7 +18,7 @@
   ],
   "license": "CC-BY-NC-SA-4.0",
   "dependencies": {
-    "bblanchon/ArduinoJson": "^7.0.3"
+    "bblanchon/ArduinoJson": "^7.2.1"
   },
   "frameworks": "arduino",
   "platforms": "espressif32"

library.properties

@@ -1,5 +1,5 @@
 name=ESP32_Wifi_Manager
-version=1.1.2
+version=1.1.3
 author=Martin Verges
 maintainer=Martin Verges <[email protected]>
 sentence=Wifi manager for ESP32 devices 

wifimanager.cpp

@@ -151,14 +151,16 @@ bool WIFIMANAGER::loadFromNVS() {
     char tmpKey[10] = { 0 };
     for(uint8_t i=0; i<WIFIMANAGER_MAX_APS; i++) {
       sprintf(tmpKey, "apName%d", i);
-      String apName = preferences.getString(tmpKey, "");
-      if (apName.length() > 0) {
-        sprintf(tmpKey, "apPass%d", i);
-        String apPass = preferences.getString(tmpKey);
-        Serial.printf("[WIFI] Load SSID '%s' to %d. slot.\n", apName.c_str(), i+1);
-        apList[i].apName = apName;
-        apList[i].apPass = apPass;
-        configuredSSIDs++;
+      if (preferences.getType(tmpKey) == PT_STR) {
+        String apName = preferences.getString(tmpKey, "");
+        if (apName.length() > 0) {
+          sprintf(tmpKey, "apPass%d", i);
+          String apPass = preferences.getString(tmpKey);
+          Serial.printf("[WIFI] Load SSID '%s' to %d. slot.\n", apName.c_str(), i+1);
+          apList[i].apName = apName;
+          apList[i].apPass = apPass;
+          configuredSSIDs++;
+        }
       }
     }
     preferences.end();