Suppress highlighting empty raise without exception to re-raise in functions (PY-27232)

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

@@ -3,10 +3,7 @@ package com.jetbrains.python.validation;
 
 import com.intellij.psi.util.PsiTreeUtil;
 import com.jetbrains.python.PyBundle;
-import com.jetbrains.python.psi.PyExceptPart;
-import com.jetbrains.python.psi.PyFinallyPart;
-import com.jetbrains.python.psi.PyRaiseStatement;
-import com.jetbrains.python.psi.PyTryExceptStatement;
+import com.jetbrains.python.psi.*;
 
 /**
  * Marks misplaced default 'except' clauses.
@@ -30,7 +27,8 @@ public class TryExceptAnnotator extends PyAnnotator {
 
   @Override
   public void visitPyRaiseStatement(PyRaiseStatement node) {
-    if (node.getExpressions().length == 0 && PsiTreeUtil.getParentOfType(node, PyExceptPart.class, PyFinallyPart.class) == null) {
+    if (node.getExpressions().length == 0 &&
+        PsiTreeUtil.getParentOfType(node, PyExceptPart.class, PyFinallyPart.class, PyFunction.class) == null) {
       markError(node, "No exception to reraise");
     }
   }

python/testData/highlighting/emptyRaise.py

@@ -9,4 +9,10 @@ except:
 try:
     raise ValueError
 finally:
-    <error descr="Python version 2.7 does not support this syntax. Raise with no arguments can only be used in an except block">raise</error>
+    <error descr="Python version 2.7 does not support this syntax. Raise with no arguments can only be used in an except block">raise</error>
+
+
+def exception_handler():
+    if undefined:
+        raise
+    log_somehow()

python/testData/highlighting/unsupportedFeaturesInPython3.py

@@ -24,4 +24,9 @@ try:
     pass
 except:
     raise
+
+def exception_handler():
+    if undefined:
+        raise
+    log_somehow()