Emit fewer DeprecationWarnings in pyreverse (#6869)

Author: jacobtylerwalls

pylint/pyreverse/inspector.py

@@ -187,13 +187,14 @@ def visit_classdef(self, node: nodes.ClassDef) -> None:
             ifaces = interfaces(node)
             if ifaces is not None:
                 node.implements = list(ifaces)
-                # TODO: 3.0: Remove support for __implements__
-                warnings.warn(
-                    "pyreverse will drop support for resolving and displaying implemented interfaces in pylint 3.0. "
-                    "The implementation relies on the '__implements__'  attribute proposed in PEP 245, which was rejected "
-                    "in 2006.",
-                    DeprecationWarning,
-                )
+                if node.implements:
+                    # TODO: 3.0: Remove support for __implements__
+                    warnings.warn(
+                        "pyreverse will drop support for resolving and displaying implemented interfaces in pylint 3.0. "
+                        "The implementation relies on the '__implements__'  attribute proposed in PEP 245, which was rejected "
+                        "in 2006.",
+                        DeprecationWarning,
+                    )
             else:
                 node.implements = []
         except astroid.InferenceError: