fixed PY-13720 PyCharm incorrectly identifies syntax error for Python 3.4

python/src/com/jetbrains/python/validation/CompatibilityVisitor.java

@@ -295,7 +295,7 @@ public abstract class CompatibilityVisitor extends PyAnnotator {
       }
     }
     commonRegisterProblem(message, " not support this syntax. Raise with no arguments can only be used in an except block",
-                          len, node, null);
+                          len, node, null, false);
     // raise 1, 2, 3
     len = 0;
     message = new StringBuilder(myCommonMessage);

python/testData/highlighting/unsupportedFeaturesInPython3.py

@@ -18,7 +18,7 @@ try:
 
 <error descr="Python version 3.0 does not have module __builtin__">import __builtin__</error>
 
-<error descr="Python version 3.0 does not support this syntax. Raise with no arguments can only be used in an except block">raise</error>
+<warning descr="Python version 3.0 does not support this syntax. Raise with no arguments can only be used in an except block">raise</warning>
 
 try:
     pass