Allow omitting image key path loader param in YAML checker

httomo/yaml_checker.py

@@ -139,6 +139,8 @@ def check_hdf5_paths_against_loader(conf: PipelineConfig, in_file_path: str) ->
         colour=Colour.GREEN,
     )
     params = conf[0]["parameters"]
+    if "image_key_path" not in params:
+        params["image_key_path"] = None
     POSSIBLE_AUTO_PARAMS = ["data_path", "image_key_path", "rotation_angles"]
     possible_auto_param_pairs = {name: params[name] for name in POSSIBLE_AUTO_PARAMS}
     auto_pairs = {k: v for k, v in possible_auto_param_pairs.items() if v == "auto"}

tests/samples/pipeline_template_examples/testing/loader_omitted_image_key_path.yaml

@@ -0,0 +1,5 @@
+- method: standard_tomo
+  module_path: httomo.data.hdf.loaders
+  parameters:
+    data_path: auto
+    rotation_angles: auto

tests/test_yaml_checker.py

@@ -87,6 +87,14 @@ def test_hdf5_paths_invalid_non_auto_value_caught_if_null_image_key_path(
     assert not check_hdf5_paths_against_loader(conf, standard_data)
 
 
+def test_hdf5_paths_accepts_omitted_image_key_path(
+    standard_data: str, sample_pipelines: str, load_yaml: Callable
+):
+    filepath = sample_pipelines + "testing/loader_omitted_image_key_path.yaml"
+    conf = load_yaml(filepath)
+    assert check_hdf5_paths_against_loader(conf, standard_data)
+
+
 def test_check_methods_exist_in_templates(sample_pipelines: str, load_yaml: Callable):
     incorrect_method_pipeline = sample_pipelines + "testing/incorrect_method.yaml"
     conf = load_yaml(incorrect_method_pipeline)