[Tests][Added] Test for empty definitions

tests/test_plot/test_yaml_errors.py

@@ -900,3 +900,11 @@ def test_line_width_max(test_dir):
     ctx.run(EXIT_BAD_CONFIG)
     assert ctx.search_err(r"`line_width` outside its range ")
     ctx.clean_up(keep_project=True)
+
+
+@pytest.mark.indep
+def test_error_empty_pth_id(test_dir):
+    ctx = context.TestContext(test_dir, PRJ, 'error_empty_pth_id')
+    ctx.run(EXIT_BAD_CONFIG)
+    assert ctx.search_err("Empty option .pth_id.")
+    ctx.clean_up(keep_project=True)

tests/yaml_samples/error_empty_pth_id.kiplot.yaml

@@ -0,0 +1,18 @@
+kibot:
+  version: 1
+
+outputs:
+
+  - name: excellon_drill
+    comment: "Excellon drill files"
+    type: excellon
+    dir: Drill
+    options:
+      generate_drill_files: false
+      pth_and_npth_single_file: false
+      pth_id: @PTH_ID@
+      map: 'pdf'
+
+...
+definitions:
+  PTH_ID: