Pie transfer reagent on collision (#7802)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Chemistry/Components/SolutionInjectOnCollideComponent.cs

@@ -1,6 +1,7 @@
 using System;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.FixedPoint;
+using Content.Shared.Inventory;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.ViewVariables;
@@ -23,5 +24,11 @@ namespace Content.Server.Chemistry.Components
 
         [DataField("transferEfficiency")]
         private float _transferEfficiency = 1f;
+
+        /// <summary>
+        /// If anything covers any of these slots then the injection fails.
+        /// </summary>
+        [DataField("blockSlots"), ViewVariables(VVAccess.ReadWrite)]
+        public SlotFlags BlockSlots = SlotFlags.MASK;
     }
 }