[!341] Assert that program is called with ini file

Merge branch 'feature/driver-assert-ini-file' into 'master'

See merge request [extensions/dune-codegen!341]

  [extensions/dune-codegen!341]: Noneextensions/dune-codegen/merge_requests/341

python/dune/codegen/pdelab/driver/__init__.py

@@ -288,6 +288,13 @@ def generate_driver():
 
     contents = []
 
+    # Assert that this program was called with ini file
+    contents += ['if (argc != 2){',
+                 '  std::cerr << "This program needs to be called with an ini file" << std::endl;',
+                 '  return 1;',
+                 '}',
+                 '']
+
     def add_section(tag, comment):
         tagcontents = [i for i in retrieve_cache_items("preamble and {}".format(tag), make_generable=True)]
         if tagcontents: