CHE-5235: Fix step into when source cannot be obtained (eclipse-che#5768)

CHE-5235: Fix step into when source cannot be obtained.

Author: mmorhun

plugins/plugin-debugger/che-plugin-debugger-ide/src/main/java/org/eclipse/che/plugin/debugger/ide/debug/AbstractDebugger.java

@@ -215,6 +215,18 @@ private void onEventListReceived(@NotNull DebuggerEventDto event) {
     }
 
     private void openCurrentFile() {
+        // Handle the situation when resource isn't found in the workspace
+        // It means that it is impossible to open it.
+        if (currentLocation.getResourcePath() == null) {
+            for (DebuggerObserver observer : observers) {
+                observer.onBreakpointStopped(currentLocation.getTarget(),
+                                             currentLocation.getTarget(),
+                                             currentLocation.getLineNumber());
+            }
+
+            return;
+        }
+
         //todo we need add possibility to handle few files
         activeFileHandler.openFile(currentLocation,
                                    new AsyncCallback<VirtualFile>() {

plugins/plugin-java-debugger/che-plugin-java-debugger-server/src/main/java/org/eclipse/che/plugin/jdb/server/JavaDebugger.java

@@ -596,7 +596,12 @@ private boolean processStepEvent(com.sun.jdi.event.StepEvent event) throws Debug
         setCurrentThread(event.thread());
         com.sun.jdi.Location jdiLocation = event.location();
 
-        Location location = debuggerUtil.getLocation(jdiLocation);
+        Location location;
+        try {
+            location = debuggerUtil.getLocation(jdiLocation);
+        } catch (DebuggerException de) {
+            location = new LocationImpl(jdiLocation.declaringType().name(), jdiLocation.lineNumber());
+        }
         debuggerCallback.onEvent(new SuspendEventImpl(location));
         return false;
     }