[bugfix] filters: empty cli option and quotes

- supports `lollipop deconvolute  --filters="" ...` to skip filters
- supports statement with quotes around column `- "column" == val`

lollipop/cli/deconvolute.py

@@ -151,6 +151,8 @@ def deconvolute(
             filters = yaml.load(file)
 
         print(f"{len(filters)} filter{ '' if len(filters) == 1 else 's' } loaded")
+    else:
+        filters = None
 
     # data
     try:

lollipop/preprocessors.py

@@ -121,15 +121,15 @@ def general_preprocess(
 
     def filter_mutations(self, filters=None):
         """filter out hardcoded problematic mutations"""
-        if filters is None:
+        if not filters:
             return self
 
         types = self.df_tally.dtypes
 
         rxprser = re.compile(
-            r"^ *(?:(?P<col>"
+            r"^ *(?P<qc>['\"]?)(?:(?P<col>"
             + r"|".join(self.df_tally.columns)
-            + r")|(?P<bad>\w+)) *(?P<op>in|[<>=~!]*) *(?P<qv>['\"]?)(?P<val>.+)(?P=qv) *$"
+            + r")|(?P<bad>\w+))(?P=qc) *(?P<op>in|[<>=~!]*) *(?P<qv>['\"]?)(?P<val>.+)(?P=qv) *$"
         )
 
         def apply_filter_statement(name, fs):