[BH-2019] Fix crash after deleting WAV alarm sound

Fix of the issue that the device would crash
when entering alarm sound selection list
after deleting selected file during alarm
ringing, but only when file's format was
WAV.

module-audio/Audio/decoder/DecoderWAV.cpp

@@ -15,6 +15,10 @@ namespace audio
 {
     DecoderWAV::DecoderWAV(const std::string &filePath) : Decoder(filePath), wav(std::make_unique<drwav>())
     {
+        if (fileSize == 0) {
+            return;
+        }
+
         if (drwav_init(wav.get(), drwavRead, drwavSeek, this, nullptr) == DRWAV_FALSE) {
             LOG_ERROR("Unable to init WAV decoder");
             return;