Fix entryname and writable

In InitialWorkDirRequirement section
if listing is set as Expression that
returns list of objects like
  [
    {
       "entry": inputs.input_name
    }
  ]
where input_name is File, cwltool
shouldn't fail trying to get
"entryname" or "writable" fields
from the Dict.

Author: michael-kotliar

cwltool/draft2tool.py

@@ -372,9 +372,9 @@ def rm_pending_output_callback(output_callbacks, jobcachepending,
                             "writable": t.get("writable")
                         }
                     else:
-                        if t["entryname"] or t["writable"]:
+                        if t.get("entryname") or t.get("writable"):
                             t = copy.deepcopy(t)
-                            if t["entryname"]:
+                            if t.get("entryname"):
                                 t["entry"]["basename"] = t["entryname"]
                             t["entry"]["writable"] = t.get("writable")
                         ls[i] = t["entry"]