Fix exception with dictionary keys with tab symbols (PY-16188)

Replace tabs in keys with special symbols for sending to debugger

python/helpers/pydev/pydevd_vars.py

@@ -200,6 +200,9 @@ def getVariable(thread_id, frame_id, scope, attrs):
     else:
         attrList = []
 
+    for attr in attrList:
+        attr.replace("@_@TAB_CHAR@_@", '\t')
+
     if scope == 'EXPRESSION':
         for count in xrange(len(attrList)):
             if count == 0:

python/pydevSrc/com/jetbrains/python/debugger/pydev/GetVariableCommand.java

@@ -26,7 +26,7 @@ public class GetVariableCommand extends GetFrameCommand {
         sb.insert(0, BY_ID).insert(0, '\t').insert(0, p.getId());
         break;
       } else {
-        sb.insert(0, p.getTempName());
+        sb.insert(0, p.getTempName().replaceAll("\t", TAB_CHAR));
       }
       p = p.getParent();
     }