If filter/filter_out pattern is a list, remove empty elements from it.

Also, fix __mk2regex bug: the returned pattern should end with $.
Bug: 193540681
Test: internal
Change-Id: Ia56856826c6b05ccf857ae5ab7a70609bf4f1e1d

Change-Id: Ie2a9bf62ee48824ce7cd5fe9e9ec2f55311473e3
diff --git a/tests/run.rbc b/tests/run.rbc
index 4d7166a..2c15b81 100644
--- a/tests/run.rbc
+++ b/tests/run.rbc
@@ -47,6 +47,9 @@
 assert_eq(["foo/%"], rblf.mkpatsubst("%", "%/%", ["foo"]))
 assert_eq(["from/a:to/a", "from/b:to/b"], rblf.product_copy_files_by_pattern("from/%", "to/%", "a b"))
 
+assert_eq([], rblf.filter(["a", "", "b"], "f"))
+assert_eq(["", "b"], rblf.filter_out(["a", "" ], ["a", "", "b"] ))
+
 globals, config = rblf.product_configuration("test/device", init)
 assert_eq(
     {