Cut generator flags

This simplifies the code, and may slightly improve performance.

Author: nickdrozd

astroid/decorators.py

@@ -111,27 +111,31 @@ def wrapped(node, context=None, _func=func, **kwargs):
 
 @wrapt.decorator
 def yes_if_nothing_inferred(func, instance, args, kwargs):
-    inferred = False
-    for node in func(*args, **kwargs):
-        inferred = True
-        yield node
-    if not inferred:
+    generator = func(*args, **kwargs)
+
+    try:
+        yield next(generator)
+    except StopIteration:
+        # generator is empty
         yield util.Uninferable
+        return
+
+    yield from generator
 
 
 @wrapt.decorator
 def raise_if_nothing_inferred(func, instance, args, kwargs):
-    inferred = False
+    generator = func(*args, **kwargs)
+
     try:
-        generator = func(*args, **kwargs)
-        while True:
-            yield next(generator)
-            inferred = True
+        yield next(generator)
     except StopIteration as error:
-        if not inferred:
-            if error.args:
-                # pylint: disable=not-a-mapping
-                raise exceptions.InferenceError(**error.args[0])
-            raise exceptions.InferenceError(
-                "StopIteration raised without any error information."
-            )
+        # generator is empty
+        if error.args:
+            # pylint: disable=not-a-mapping
+            raise exceptions.InferenceError(**error.args[0])
+        raise exceptions.InferenceError(
+            "StopIteration raised without any error information."
+        )
+
+    yield from generator