[bugfix] KeyError: 'no inserts_bedfile defined for protocol None'

- proto == None cast as a str

workflow/rules/signatures.smk

@@ -6,6 +6,10 @@ __maintainer__ = "Ivan Topolsky"
 __email__ = "[email protected]"
 
 
+wildcard_constraints:
+    proto=".*",
+
+
 def all_vocs(dir):
     if not dir:
         return []
@@ -14,7 +18,12 @@ def all_vocs(dir):
 
 
 def proto_inserts(wildcards):
-    return protocol_proto_option(proto=wildcards.proto, option="inserts_bedfile")
+    proto = (
+        None
+        if isinstance(wildcards.proto, str) and wildcards.proto in {"None", ""}
+        else wildcards.proto
+    )
+    return protocol_proto_option(proto=proto, option="inserts_bedfile")
 
 
 rule amplicons:
@@ -47,7 +56,8 @@ rule amplicons:
 
 
 def get_sample_amplicons(wildcards):
-    return cohortdir("amplicons.%s.yaml" % get_sample_protocol(wildcards))
+    proto = get_sample_protocol(wildcards)
+    return cohortdir("amplicons.%s.yaml" % ("" if proto is None else proto))
 
 
 rule cooc:
@@ -86,10 +96,15 @@ rule cooc:
 
 
 def proto_datasets(wildcards):
+    proto = (
+        None
+        if isinstance(wildcards.proto, str) and wildcards.proto in {"None", ""}
+        else wildcards.proto
+    )
     return [
         sample_paths[s_rec]
         for s_rec, s_row in sample_table.items()
-        if s_row.protocol == wildcards.proto
+        if s_row.protocol == proto
     ]