Add check for non-existent buffer

kernel/src/holeybytes/ecah.rs

@@ -77,8 +77,8 @@ pub fn handler(vm: &mut Vm) {
                 buffer_id => {
                     let mut buffs = IPC_BUFFERS.lock();
 
-                    let mut buff = buffs.get_mut(&buffer_id).unwrap();
-
+                    match buffs.get_mut(&buffer_id) {
+                        Some(buff) => {
                             let mut msg_vec = vec![];
 
                             for x in 0..(length as isize) {
@@ -91,6 +91,9 @@ pub fn handler(vm: &mut Vm) {
                                 "Message {:?} has been sent to Buffer({})",
                                 msg_vec, buffer_id
                             );
+                        }
+                        None => log::error!("Access of non-existent buffer")
+                    }
                     drop(buffs);
                 }
             }

sysdata/test-programs/main.rhai

@@ -8,6 +8,7 @@ fn main(){
     std::Trace("Trace Deez");
     
     std::ipc_send(2, 0, 0);
+    std::ipc_send(3, 0, 0);
 
     tx();
 }