API: Fix bug in Guide/GetProgramGuide when details are not requested

If Details=true is not specified, some details, including Season and
Episode are not returned. However it was returning random garbage for
those fields. Changed to initialize all fields to zero in case they are
not being valued.

mythtv/programs/mythbackend/servicesv2/v2programAndChannel.h

@@ -68,6 +68,7 @@ class V2ChannelInfo : public QObject
 
         Q_INVOKABLE V2ChannelInfo(QObject *parent = nullptr)
             :   QObject           ( parent ),
+                m_ChanId            (0),
                 m_MplexId           (0),
                 m_ServiceId         (0),
                 m_ATSCMajorChan     (0),
@@ -173,7 +174,16 @@ class V2Program : public QObject
     public:
 
         Q_INVOKABLE V2Program(QObject *parent = nullptr)
-            : QObject( parent )
+            : QObject( parent ),
+            m_Repeat            (false),
+            m_Stars             (0),
+            m_ProgramFlags      (0),
+            m_VideoProps        (0),
+            m_AudioProps        (0),
+            m_Season            (0),
+            m_Episode           (0),
+            m_TotalEpisodes     (0),
+            m_FileSize          (0)
         {
         }