fix: memory leak in UnitAura and bump version to 1.4.2

HealBot_Controller_Aura.lua

@@ -115,13 +115,6 @@ function HealBot_CheckBuffs(unit)
     end
 end
 
-function HealBot_OnEvent_UnitAura(this, unit)
-    local DebuffType;
-    
-    if HealBot_Heals[unit] and unit ~= "target" then
-        HealBot_UnitIcons[unit] = {}
-        local iconCount = 0
-        
 local HealBot_TrackedHoTs = {
     ["Interface\\Icons\\Spell_Holy_Renew"] = true,
     ["Interface\\Icons\\Spell_Nature_Rejuvenation"] = true,
@@ -132,6 +125,17 @@ function HealBot_OnEvent_UnitAura(this, unit)
     ["Interface\\Icons\\btnholyscriptures"] = true,
 }
 
+function HealBot_OnEvent_UnitAura(this, unit)
+    local DebuffType;
+    
+    if HealBot_Heals[unit] and unit ~= "target" then
+        if not HealBot_UnitIcons[unit] then
+            HealBot_UnitIcons[unit] = {}
+        end
+        for j = 1, 5 do
+            HealBot_UnitIcons[unit][j] = nil
+        end
+        local iconCount = 0
         local i = 1;
         while true do
             local debuff, tmp, debuff_type = UnitDebuff(unit, i, 1)