Safety net to handle MaxSize=0. Some users still have 0 = unlimited in their db and migration failed for them.

src/NzbDrone.Core/DecisionEngine/Specifications/AcceptableSizeSpecification.cs

@@ -57,7 +57,7 @@ namespace NzbDrone.Core.DecisionEngine.Specifications
                     return Decision.Reject("{0} is smaller than minimum allowed: {1}", subject.Release.Size.SizeSuffix(), minSize.SizeSuffix());
                 }
             }
-            if (!qualityDefinition.MaxSize.HasValue)
+            if (!qualityDefinition.MaxSize.HasValue || qualityDefinition.MaxSize.Value == 0)
             {
                 _logger.Debug("Max size is unlimited - skipping check.");
             }