Two bug fixes:

    - fix Call::~Call when an exception is thrown
    - fix case where measure paint device's device has no painter

src/Wt/Dbo/Call

@@ -33,7 +33,7 @@ public:
    * This executes the call if it wasn't run() yet, and the call has not
    * been copied.
    */
-  ~Call();
+  ~Call() WT_CXX11ONLY(noexcept(false));
 
   /*! \brief Copy constructor.
    *
@@ -47,6 +47,11 @@ public:
    */
   template<typename T> Call& bind(const T& value);
 
+  /*! \brief Runs the database call.
+   *
+   * This may throw an exception if there was a problem with the SQL
+   * command.
+   */
   void run();
 
 private:

src/Wt/Dbo/Call.C

@@ -5,7 +5,7 @@
 namespace Wt {
   namespace Dbo {
 
-Call::~Call()
+Call::~Call() WT_CXX11ONLY(noexcept(false))
 {
   if (!copied_ && !run_)
     run();

src/Wt/WMeasurePaintDevice.C

@@ -27,7 +27,6 @@ WFlags<WPaintDevice::FeatureFlag> WMeasurePaintDevice::features() const
 void WMeasurePaintDevice::init()
 {
   if (!device_->painter()) {
-    painter_ = new WPainter();
     device_->setPainter(painter_);
   } else
     device_->painter()->save();
@@ -37,7 +36,6 @@ void WMeasurePaintDevice::done()
 {
   if (painter_ == device_->painter()) {
     device_->setPainter(0);
-    delete painter_;
   } else
     device_->painter()->restore();
 }