Function from_units should always return float

Probably closes #1557

sabnzbd/misc.py

@@ -467,7 +467,7 @@ def from_units(val):
     """ Convert K/M/G/T/P notation to float """
     val = str(val).strip().upper()
     if val == "-1":
-        return val
+        return float(val)
     m = RE_UNITS.search(val)
     if m:
         if m.group(2):

tests/test_misc.py

@@ -105,6 +105,7 @@ class TestMisc:
         assert (3010194, True) == misc.convert_version("3.1.1RC14")
 
     def test_from_units(self):
+        assert -1.0 == misc.from_units("-1")
         assert 100.0 == misc.from_units("100")
         assert 1024.0 == misc.from_units("1KB")
         assert 1048576.0 == misc.from_units("1024KB")