Core/Misc: Fix issues reported by static analysis

Coverity defect IDs: 1023036, 1022620

src/server/game/Entities/Unit/Unit.cpp

@@ -5930,7 +5930,7 @@ bool Unit::HandleDummyAuraProc(Unit* victim, uint32 damage, AuraEffect* triggere
                 case 55677:
                 {
                     // Dispel Magic shares spellfamilyflag with abolish disease
-                    if (procSpell->SpellIconID != 74)
+                    if (!procSpell || procSpell->SpellIconID != 74)
                         return false;
                     if (!target || !target->IsFriendlyTo(this))
                         return false;

src/server/game/Loot/LootMgr.cpp

@@ -853,7 +853,7 @@ ByteBuffer& operator<<(ByteBuffer& b, LootItem const& li)
 {
     b << uint32(li.itemid);
     b << uint32(li.count);                                  // nr of items of this type
-    b << uint32(sObjectMgr->GetItemTemplate(li.itemid)->DisplayInfoID);
+    b << uint32(ASSERT_NOTNULL(sObjectMgr->GetItemTemplate(li.itemid))->DisplayInfoID);
     b << uint32(li.randomSuffix);
     b << uint32(li.randomPropertyId);
     //b << uint8(0);                                        // slot type - will send after this function call