SPIGOT-1875: Broken leashes not dropping

nms-patches/EntityInsentient.patch

@@ -136,7 +136,17 @@
                  this.unleash(true, true);
              }
          }
-@@ -1037,6 +1102,7 @@
+@@ -967,7 +1032,9 @@
+             this.bC = false;
+             this.leashHolder = null;
+             if (!this.world.isClientSide && flag1) {
++                this.forceDrops = true; // CraftBukkit
+                 this.a(Items.LEAD, 1);
++                this.forceDrops = false; // CraftBukkit
+             }
+ 
+             if (!this.world.isClientSide && flag && this.world instanceof WorldServer) {
+@@ -1037,6 +1104,7 @@
  
                  this.leashHolder = entityleash;
              } else {