Fix param widget init

src/ui/QGCBaseParamWidget.cc

@@ -20,8 +20,6 @@ QGCBaseParamWidget::QGCBaseParamWidget(QWidget *parent) :
 QGCBaseParamWidget* QGCBaseParamWidget::initWithUAS(UASInterface *uas)
 {
     setUAS(uas);
-    layoutWidget();
-
     return this;
 }
 
@@ -34,11 +32,16 @@ void QGCBaseParamWidget::setUAS(UASInterface* uas)
         clearOnboardParamDisplay();
         clearPendingParamDisplay();
     }
+
     mav = uas;
+
+    if (mav) {
         connectToParamManager();
         connectViewSignalsAndSlots();
+        layoutWidget();
 
         paramMgr->requestParameterListIfEmpty();
+    }
 
 }
 

src/ui/QGCPX4VehicleConfig.cc

@@ -85,8 +85,13 @@ QGCPX4VehicleConfig::QGCPX4VehicleConfig(QWidget *parent) :
 
     //TODO connect buttons here to save/clear actions?
     mav = UASManager::instance()->getActiveUAS();
+    if (!mav) {
+        qWarning() << "No active mav! ";
+    }
+    else {
         ui->pendingCommitsWidget->initWithUAS(mav);
         ui->pendingCommitsWidget->update();
+    }
 
     //TODO the following methods are not yet implemented
 
@@ -872,6 +877,8 @@ void QGCPX4VehicleConfig::setActiveUAS(UASInterface* active)
 
     paramMgr = mav->getParamManager();
 
+    ui->pendingCommitsWidget->setUAS(mav);
+
     // Reset current state
     resetCalibrationRC();
     //TODO eliminate the separate RC_TYPE call