h5variables: return empty if group doesn't exist

Author: scivision

+stdlib/+hdf5nc/h5variables.m

@@ -22,7 +22,14 @@
 
 names = string.empty;
 
-finf = h5info(file, group);
+try
+  finf = h5info(file, group);
+catch e
+  if e.identifier == "MATLAB:imagesci:h5info:unableToFind"
+    return
+  end
+  rethrow(e)
+end
 
 ds = finf.Datasets;
 

+stdlib/+test/TestHDF5.m

@@ -91,11 +91,12 @@ function test_get_variables(tc)
 tc.verifyEqual(sort(v), ["x", "y"])
 
 % traversal
-v = h5variables(basic, "/j");
-tc.verifyEmpty(v)
+tc.verifyEmpty( h5variables(basic, "/j") )
 
-v = h5variables(basic, "/j/a");
-tc.verifyEqual(v, "b")
+% non-existant group
+tc.verifyEmpty( h5variables(basic, "/nothere") )
+
+tc.verifyEqual( h5variables(basic, "/j/a") , "b")
 
 end