FIXED do not crash if there is no testdata dir

sdk/libraries/core/Core.cpp

@@ -277,7 +277,7 @@ const QString Core::getConfig() {
 }
 
 // ------------- getInstallDirectories (static) -----------------
-const QStringList Core::getInstallDirectories(QString suffix) {
+const QStringList Core::getInstallDirectories(QString suffix, bool exitOnError) {
     QStringList dir;
 
     // find the build directory according to the current directory
@@ -298,8 +298,9 @@ const QStringList Core::getInstallDirectories(QString suffix) {
         dir.append(globalInstallDir.canonicalPath().toUtf8());
     }
 
-    if (dir.empty()) {
-        QString msg = QObject::tr("Installation directory not found: no extensions can be found. Exiting. If you did not install CamiTK, you should at least set your current working directory to CamiTK Community Edition build dir. Note: the current working directory is %1").arg(getCurrentWorkingDir());
+    if (dir.empty() && exitOnError) {
+	QString ext=QFileInfo(suffix).completeBaseName();
+        QString msg = QObject::tr("Installation directory not found: no %1 extensions can be found. Exiting. If you did not install CamiTK, you should at least set your current working directory to CamiTK Community Edition build dir. Note: the current working directory is %2, looking for %3").arg(ext, getCurrentWorkingDir(), suffix);
         qDebug() << msg; // to force show on console
         CAMITK_ERROR_ALT(msg);
         throw AbortException(msg.toStdString());
@@ -335,7 +336,8 @@ const QStringList Core::getViewerDirectories() {
 
 // ------------- getTestDataDir (static) -----------------
 const QString Core::getTestDataDir() {
-    QStringList testDataDirectories = getInstallDirectories("share/" + QString(Core::shortVersion) + "/testdata");
+    // check the testdata installation directory (but do not exit if it does not exist)
+    QStringList testDataDirectories = getInstallDirectories("share/" + QString(Core::shortVersion) + "/testdata", false);
     // just returns the first one if exists
     if (testDataDirectories.size() > 0) {
         return testDataDirectories.at(0);

sdk/libraries/core/Core.h

@@ -120,8 +120,13 @@ public:
      *  3. CamiTK SDK installation directory (global install tree)
      *
      * It uses getExtensionDirectories() to take multiarch into account
+     *
+     * If no directory is available and exitOnError is true, the application exits.
+     * There are situation (namely for checking testdata dir) where it not mandatory
+     * to find a directory. In this case, exitOnError should be set to false so that
+     * the application does not exit.
      */
-    static const QStringList getInstallDirectories(QString suffix);
+    static const QStringList getInstallDirectories(QString suffix, bool exitOnError = true);
 
     /// get more information about installation, etc...
     static const QString getConfig();