fix: DAP will not remove final breakpoint during a debugging session

Fixes #1316

Signed-off-by: azerr <azerr@redhat.com>

Author: angelozerr

src/main/java/com/redhat/devtools/lsp4ij/dap/breakpoints/BreakpointHandlerBase.java

@@ -82,7 +82,7 @@ public void unregisterBreakpoint(@NotNull B breakpoint,
         }
         breakpoints.remove(breakpoint);
         sendBreakpoints(null,
-                new TemporaryBreakpoint(sourcePosition, false));
+                breakpoints.isEmpty() ? new TemporaryBreakpoint(sourcePosition, false) : null);
     }
 
     @Override
@@ -92,7 +92,8 @@ public void dispose() {
 
     protected CompletableFuture<@Nullable Void> sendBreakpoints(@Nullable IDebugProtocolServer debugProtocolServer,
                                                                 @Nullable TemporaryBreakpoint temporaryBreakpoint) {
-        if (debugProtocolServers.isEmpty() || breakpoints.isEmpty()) {
+        if (debugProtocolServers.isEmpty() || (breakpoints.isEmpty() && temporaryBreakpoint == null)) {
+            // DAP servers are not started or there are no breakpoints to send
             return CompletableFuture.completedFuture(null);
         }
         return doSendBreakpoints(debugProtocolServer, temporaryBreakpoint);