filtered empty strings

xsa/chart.py

@@ -22,8 +22,12 @@ def count_substrings(substrings, strings):
     if strings == []:
         return []
 
+    subs = list(set(substrings))
+
     results = defaultdict(int)
-    for sub,string in product(substrings, strings):
+    for sub,string in product(subs, strings):
+        if sub == '':
+            continue
         results[sub] # create key
         if sub.lower() in string.lower():
             results[sub] += 1