Various fixes

src/SpotifyArduino.cpp

@@ -83,7 +83,14 @@ int SpotifyArduino::makeRequestWithBody(const char *type, const char *command, c
 
     client->println();
 
-    client->print(body);
+    if (strlen(body) == 0)
+    {
+        client->println();
+    }
+    else
+    {
+        client->print(body);
+    }
 
     if (client->println() == 0)
     {
@@ -615,6 +622,10 @@ int SpotifyArduino::getCurrentlyPlaying(processCurrentlyPlaying currentlyPlaying
             {
                 current.currentlyPlayingType = episode;
             }
+            else if (strcmp(currently_playing_type, "ad") == 0)
+            {
+                current.currentlyPlayingType = ad;
+            }
             else
             {
                 current.currentlyPlayingType = other;

src/SpotifyArduino.h

@@ -97,6 +97,7 @@ enum SpotifyPlayingType
 {
   track,
   episode,
+  ad,
   other
 };
 
@@ -226,9 +227,9 @@ class SpotifyArduino
 
 private:
   char _bearerToken[SPOTIFY_ACCESS_TOKEN_LENGTH + 10]; //10 extra is for "bearer " at the start
-  char *_refreshToken;
-  const char *_clientId;
-  const char *_clientSecret;
+  char *_refreshToken = nullptr;
+  const char *_clientId = nullptr;
+  const char *_clientSecret = nullptr;
   unsigned int timeTokenRefreshed;
   unsigned int tokenTimeToLiveMs;
   int commonGetImage(char *imageUrl);