Chem Master & Dispenser Power Fixes (#1622)

* -ChemDispenser & Master can now open the UI without power
-Both can also eject beaker without power

* -Disables button if not powered
-Disables clear & eject buttons if no beaker

* Fix server freeze

Content.Client/GameObjects/Components/Chemistry/ReagentDispenser/ReagentDispenserWindow.cs

@@ -161,6 +161,29 @@ namespace Content.Client.GameObjects.Components.Chemistry
             }
         }
 
+        /// <summary>
+        /// This searches recursively through all the children of "parent"
+        /// and sets the Disabled value of any buttons found to "val"
+        /// </summary>
+        /// <param name="parent">The control which childrens get searched</param>
+        /// <param name="val">The value to which disabled gets set</param>
+        private void SetButtonDisabledRecursive(Control parent, bool val)
+        {
+            foreach (var child in parent.Children)
+            {
+                if (child is Button but)
+                {
+                    but.Disabled = val;
+                    continue;
+                }
+
+                if (child.Children != null)
+                {
+                    SetButtonDisabledRecursive(child, val);
+                }
+            }
+        }
+
         /// <summary>
         /// Update the UI state when new state data is received from the server.
         /// </summary>
@@ -171,6 +194,20 @@ namespace Content.Client.GameObjects.Components.Chemistry
             Title = castState.DispenserName;
             UpdateContainerInfo(castState);
 
+            // Disable all buttons if not powered
+            if (Contents.Children != null)
+            {
+                SetButtonDisabledRecursive(Contents, !castState.HasPower);
+                EjectButton.Disabled = false;
+            }
+
+            // Disable the Clear & Eject button if no beaker
+            if (!castState.HasBeaker)
+            {
+                ClearButton.Disabled = true;
+                EjectButton.Disabled = true;
+            }
+
             switch (castState.SelectedDispenseAmount.Int())
             {
                 case 1: