fix warning

(cherry picked from commit cd3adc0)

src/core/qgsprojectproperty.cpp

@@ -21,6 +21,18 @@
 #include <QDomDocument>
 #include <QStringList>
 
+QgsProperty::QgsProperty()
+{
+}
+
+QgsProperty::~QgsProperty()
+{
+}
+
+QgsPropertyValue::~QgsPropertyValue()
+{
+}
+
 void QgsPropertyValue::dump( int tabs ) const
 {
   QString tabString;

src/core/qgsprojectproperty.h

@@ -47,12 +47,8 @@ class QDomDocument;
 class CORE_EXPORT QgsProperty
 {
   public:
-
-    QgsProperty()
-    {}
-
-    virtual ~ QgsProperty()
-    {}
+    QgsProperty();
+    virtual ~QgsProperty();
 
     /** Dumps out the keys and values
      *
@@ -124,7 +120,7 @@ class CORE_EXPORT QgsPropertyValue : public QgsProperty
         : value_( value )
     {}
 
-    virtual ~QgsPropertyValue() {}
+    virtual ~QgsPropertyValue();
 
     /** Returns true if is a QgsPropertyKey */
     virtual bool isKey() const override { return false; }
@@ -189,7 +185,7 @@ class CORE_EXPORT QgsPropertyKey : public QgsProperty
 {
   public:
     QgsPropertyKey( const QString &name = "" );
-    virtual ~ QgsPropertyKey();
+    virtual ~QgsPropertyKey();
 
     /// every key has a name
     // @{
@@ -207,7 +203,7 @@ class CORE_EXPORT QgsPropertyKey : public QgsProperty
 
 
     /// add the given property key
-    QgsPropertyKey * addKey( const QString & keyName )
+    QgsPropertyKey *addKey( const QString & keyName )
     {
       delete mProperties.take( keyName );
       mProperties.insert( keyName, new QgsPropertyKey( keyName ) );