Assume param dups are not fatal

If we get a dup, clear the default value since we can’t trust it

src/AutoPilotPlugins/PX4/PX4ParameterLoader.cc

@@ -145,7 +145,7 @@ void PX4ParameterLoader::loadParameterFactMetaData(void)
                     qWarning() << "Badly formed XML";
                     return;
                 }
-                if (intVersion <= 1) {
+                if (intVersion <= 2) {
                     // We can't read these old files
                     qDebug() << "Parameter version stamp too old, skipping load" << parameterFilename;
                     return;
@@ -218,9 +218,12 @@ void PX4ParameterLoader::loadParameterFactMetaData(void)
                 metaData = new FactMetaData(foundType);
                 Q_CHECK_PTR(metaData);
                 metaData->setGroup(factGroup);
-                if (!_mapParameterName2FactMetaData.contains(name)) {
+                if (_mapParameterName2FactMetaData.contains(name)) {
+                    // We can't trust the default value since we have dups
+                    qDebug() << "Duplicate parameter found:" << name;
+                    _mapParameterName2FactMetaData[name]->clearDefaultValue();
+                } else {
                     _mapParameterName2FactMetaData[name] = metaData;
-                }
                     
                     if (xml.attributes().hasAttribute("default")) {
                         bool convertOk;
@@ -232,6 +235,7 @@ void PX4ParameterLoader::loadParameterFactMetaData(void)
                             qDebug() << "Parameter meta data with bad default value, name:" << name << " type:" << type << " default:" << strDefault;
                         }
                     }
+                }
                 
             } else {
                 // We should be getting meta data now