Fix crashes when starting the application if no linphonerc file exists yet.

src/components/other/colors/Colors.cpp

@@ -71,7 +71,7 @@ void Colors::overrideColors (const shared_ptr<linphone::Config> &config) {
   for (int i = info->propertyOffset(); i < info->propertyCount(); ++i) {
     const QMetaProperty metaProperty = info->property(i);
     const string colorName = metaProperty.name();
-    const string colorValue = config->getString(COLORS_SECTION, colorName, "");
+    const string colorValue = config ? config->getString(COLORS_SECTION, colorName, "") : "";
 
     if (!colorValue.empty())
       setProperty(colorName.c_str(), QColor(::Utils::coreStringToAppString(colorValue)));

src/components/settings/SettingsModel.cpp

@@ -773,11 +773,11 @@ void SettingsModel::setLogsEmail (const QString &email) {
 // ---------------------------------------------------------------------------
 
 QString SettingsModel::getLogsFolder (const shared_ptr<linphone::Config> &config) {
-  return ::Utils::coreStringToAppString(
-    config->getString(UI_SECTION, "logs_folder", Paths::getLogsDirPath())
-  );
+  return ::Utils::coreStringToAppString(config
+    ? config->getString(UI_SECTION, "logs_folder", Paths::getLogsDirPath())
+    : Paths::getLogsDirPath());
 }
 
 bool SettingsModel::getLogsEnabled (const shared_ptr<linphone::Config> &config) {
-  return config->getInt(UI_SECTION, "logs_enabled", false);
+  return config ? config->getInt(UI_SECTION, "logs_enabled", false) : false;
 }