Clean up search for h0 strings

scripts/plotting/tape_recorder.py

@@ -46,16 +46,15 @@ def tape_recorder(adfobj):
     cam_hist_strs = adfobj.hist_string["test_hist_str"]
 
     # Filter the list to include only strings that are exactly in the possible h0 strings
-    # - Search for either h0 of h0a
-    substrings = ["cam.h0","cam.h0a"]
+    # - Search for either h0 or h0a
+    substrings = {"cam.h0","cam.h0a"}
     case_hist_strs = []
-    for i,cam_case_str in enumerate(cam_hist_strs):
-        cam_hist_str = []
+    for cam_case_str in cam_hist_strs:
         # Check each possible h0 string
         for string in cam_case_str:
             if string in substrings:
-                cam_hist_str.append(string)
-        case_hist_strs.append(cam_hist_str[0])
+               case_hist_strs.append(string)
+               break
 
     #Grab test case climo years
     start_years = adfobj.climo_yrs["syears"]