fix: TypeError if no SVGPaths are set (#212)

Users may not have SVG Paths set, which leads to the Error described.
GIScience · Jan 15, 2024 · f895374 · f895374
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -39,6 +39,11 @@ RELEASING:
 13. Create new release in GitHub with tag version and release title of `vX.X.X`
  -->
 
+## Unreleased
+
+### Fixed
+- TypeError if no SVGPaths are set ([#212](https://github.com/GIScience/orstools-qgis-plugin/issues/212))
+
 ## [1.7.0] - 2023-12-22
 
 ### Added

diff --git a/ORStools/gui/ORStoolsDialog.py b/ORStools/gui/ORStoolsDialog.py
@@ -247,7 +247,7 @@ def run_gui_control(self):
 
         # add ors svg path
         my_new_path = os.path.join(basepath, "img/svg")
-        svg_paths = QSettings().value("svg/searchPathsForSVG")
+        svg_paths = QSettings().value("svg/searchPathsForSVG") or []
         if my_new_path not in svg_paths:
             svg_paths.append(my_new_path)
             QSettings().setValue("svg/searchPathsForSVG", svg_paths)