Report python errors when running python commands from qgis gui (e.g. run actions, feature form init).

Try to delete feature form only if exists (#2590).


git-svn-id: http://svn.osgeo.org/qgis/trunk@13751 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

src/app/qgisapp.cpp

@@ -6546,7 +6546,7 @@ void QgisApp::runPythonString( const QString &expr )
 {
   if ( mPythonUtils && mPythonUtils->isEnabled() )
   {
-    mPythonUtils->runStringUnsafe( expr );
+    mPythonUtils->runString( expr );
   }
 }
 

src/app/qgsattributedialog.cpp

@@ -331,7 +331,8 @@ void QgsAttributeDialog::dialogDestroyed()
   mLayer->setProperty( "featureForm.dialog", QVariant() );
   mLayer->setProperty( "featureForm.id", QVariant() );
 #endif
-  QgisApp::instance()->runPythonString( QString( "del _qgis_featureform_%1" ).arg( mLayer->getLayerID() ) );
+  QString expr = QString( "if locals().has_key('_qgis_featureform_%1'): del _qgis_featureform_%1\n" ).arg( mLayer->getLayerID() );
+  QgisApp::instance()->runPythonString( expr );
 
   mDialog = NULL;
   deleteLater();

src/python/qgspythonutils.h

@@ -50,6 +50,10 @@ class PYTHON_EXPORT QgsPythonUtils
 
     /* console */
 
+    //! run a statement, show an error message on error
+    //! @return true if no error occured
+    virtual bool runString( const QString& command, QString msgOnError = QString() ) = 0;
+
     //! run a statement, error reporting is not done
     //! @return true if no error occured
     virtual bool runStringUnsafe( const QString& command, bool single = true ) = 0;