Fix assertion when removing all elements from model

plugins/channelrx/demodadsb/adsbdemodgui.h

@@ -378,14 +378,17 @@ public:
     }
 
     void removeAllAirports() {
-        beginRemoveRows(QModelIndex(), 0, m_airports.count());
-        m_airports.clear();
-        m_airportDataFreq.clear();
-        m_airportDataFreqRows.clear();
-        m_showFreq.clear();
-        m_azimuth.clear();
-        m_elevation.clear();
-        endRemoveRows();
+        if (m_airports.count() > 0)
+        {
+            beginRemoveRows(QModelIndex(), 0, m_airports.count() - 1);
+            m_airports.clear();
+            m_airportDataFreq.clear();
+            m_airportDataFreqRows.clear();
+            m_showFreq.clear();
+            m_azimuth.clear();
+            m_elevation.clear();
+            endRemoveRows();
+        }
     }
 
     int rowCount(const QModelIndex &parent = QModelIndex()) const override {

plugins/channelrx/demodvor/vordemodgui.h

@@ -143,12 +143,15 @@ public:
     }
 
     void removeAllVORs() {
-        beginRemoveRows(QModelIndex(), 0, m_vors.count());
-        m_vors.clear();
-        m_selected.clear();
-        m_radials.clear();
-        m_vorGUIs.clear();
-        endRemoveRows();
+        if (m_vors.count() > 0)
+        {
+            beginRemoveRows(QModelIndex(), 0, m_vors.count() - 1);
+            m_vors.clear();
+            m_selected.clear();
+            m_radials.clear();
+            m_vorGUIs.clear();
+            endRemoveRows();
+        }
     }
 
     QHash<int, QByteArray> roleNames() const {

plugins/feature/map/mapgui.h

@@ -351,10 +351,13 @@ public:
 
     void removeAll()
     {
-        beginRemoveRows(QModelIndex(), 0, m_items.count());
-        m_items.clear();
-        m_selected.clear();
-        endRemoveRows();
+        if (m_items.count() > 0)
+        {
+            beginRemoveRows(QModelIndex(), 0, m_items.count());
+            m_items.clear();
+            m_selected.clear();
+            endRemoveRows();
+        }
     }
 
     void setDisplayNames(bool displayNames)

plugins/feature/vorlocalizer/vorlocalizergui.h

@@ -144,12 +144,15 @@ public:
     }
 
     void removeAllVORs() {
-        beginRemoveRows(QModelIndex(), 0, m_vors.count());
-        m_vors.clear();
-        m_selected.clear();
-        m_radials.clear();
-        m_vorGUIs.clear();
-        endRemoveRows();
+        if (m_vors.count() > 0)
+        {
+            beginRemoveRows(QModelIndex(), 0, m_vors.count() - 1);
+            m_vors.clear();
+            m_selected.clear();
+            m_radials.clear();
+            m_vorGUIs.clear();
+            endRemoveRows();
+        }
     }
 
     QHash<int, QByteArray> roleNames() const {