skip_missing during compare

exciter.py

@@ -302,11 +302,12 @@ def load_opti_log(logfile):
 
 # Functions to compare metadata for two or more saved data files
 
-def compare(dicts):
+def compare(dicts, skip_missing=True):
     differences = []
     keys = {k for dic in dicts for k in dic}
     for key in keys:
-        values = [dic[key] for dic in dicts]
+        values = [dic.get(key) for dic in dicts]
+        if skip_missing and None in values: continue
         if type(values[0]) is dict:
             for diff in compare(values):
                 differences.append([key + " : " + diff[0], *diff[1:]])
@@ -327,13 +328,13 @@ def _load_yml(fname):
         raw = raw.replace('(', '[').replace(')',']')
         return yaml.safe_load(raw)
 
-def yml_diff(fnames):
+def yml_diff(fnames, skip_missing=True):
     meta = {}
     for fname in fnames:
         meta[fname] = _load_yml(find_file(fname, yml=True))
     
     # compare
-    diff = compare(meta.values())
+    diff = compare(meta.values(), skip_missing=skip_missing)
     
     
     diff.append(["", *fnames])