Re #8686. Added error report to ApplicationWindow.

This was done by adding a slot for the error signal and turning
it into a log message and exiting.

Code/Mantid/MantidPlot/src/ApplicationWindow.cpp

@@ -16353,6 +16353,7 @@ void ApplicationWindow::executeScriptFile(const QString & filename, const Script
     code += in.readLine() + "\n";
   }
   Script *runner = scriptingEnv()->newScript(filename, this, Script::NonInteractive);
+  connect(runner, SIGNAL(error(const QString &, const QString &, int)), this, SLOT(onScriptExecuteError(const QString &, const QString &, int)));
   runner->redirectStdOut(false);
   scriptingEnv()->redirectStdOut(false);
   if(execMode == Script::Asynchronous)
@@ -16373,6 +16374,24 @@ void ApplicationWindow::executeScriptFile(const QString & filename, const Script
   delete runner;
 }
 
+/**
+ * This is the slot for handing script execution errors. It is only
+ * attached by ::executeScriptFile which is only done in the '-xq'
+ * command line option.
+ *
+ * @param message Normally the stacktrace of the error.
+ * @param scriptName The name of the file.
+ * @param lineNumber The line number in the script that caused the error.
+ */
+void ApplicationWindow::onScriptExecuteError(const QString & message, const QString & scriptName, int lineNumber)
+{
+  g_log.fatal() << "Fatal error on line " << lineNumber << " of \"" << scriptName.toStdString()
+            << "\" encountered:\n"
+            << message.toStdString();
+  this->setExitCode(1);
+  this->exitWithPresetCode();
+}
+
 /**
 * Run Python code
 * @param code :: An arbitrary string of python code

Code/Mantid/MantidPlot/src/ApplicationWindow.h

@@ -238,6 +238,8 @@ public slots:
   ApplicationWindow * loadScript(const QString& fn);
   /// Runs a script from a file. Mainly useful for automatically running scripts
   void executeScriptFile(const QString & filename, const Script::ExecutionMode execMode);
+  /// Slot to connect the script execution errors to
+  void onScriptExecuteError(const QString & message, const QString & scriptName, int lineNumber);
   /// Runs an arbitrary lump of python code, return true/false on success/failure.
   bool runPythonScript(const QString & code, bool async = false, bool quiet=false, bool redirect=true);