add missing return

I noticed that I did not include a `return` if the user simply searches for a non-existent pod. So,
I added the `return` statement. In order to make a test for this, I realized I would need to parse
the output of `warnet logs` to search for "Traceback (" in order to see if there is some kind of
error. Otherwise, if I simple "expect" a message, the test will pass even though the program errors
out with some kind of stack trace.

That is why I made `expect_without_traceback`. It will catch the missing `return` statement. I will
add expect_without_traceback to my other pexpect statements in the next commit.

src/warnet/control.py

@@ -430,6 +430,7 @@ def format_pods(pods: list[V1Pod], namespace: Optional[str]) -> list[str]:
 
             if not namespaces:
                 click.echo(f"Could not find pod in any namespaces: {pod_name}")
+                return
 
             namespace = namespaces[0]
 

test/namespace_admin_test.py

@@ -201,6 +201,11 @@ def bob_checks_logs(self):
         )
         self.sut.expect(bitcoin_version_slug, timeout=10)
         self.sut.close()
+        self.sut = pexpect.spawn("warnet logs this_does_not_exist", maxread=4096 * 10)
+        assert expect_without_traceback(
+            "Could not find pod in any namespaces", self.sut, timeout=10
+        )
+        self.sut.close()
         self.log.info("Bob has checked the logs")
         assert self.this_is_the_current_context(self.bob_context)
 
@@ -226,6 +231,11 @@ def admin_checks_logs(self):
         )
         self.sut.expect(bitcoin_version_slug, timeout=10)
         self.sut.close()
+        self.sut = pexpect.spawn("warnet logs this_does_not_exist", maxread=4096 * 10)
+        assert expect_without_traceback(
+            "Could not find pod in any namespaces", self.sut, timeout=10
+        )
+        self.sut.close()
         self.log.info("The admin has checked the logs")
         assert self.this_is_the_current_context(self.initial_context)
 
@@ -244,6 +254,27 @@ def remove_context(kubeconfig_data: dict, context_name: str) -> dict:
     return kubeconfig_data
 
 
+class StackTraceFoundException(Exception):
+    """Custom exception raised when a stack trace is found in the output."""
+
+    pass
+
+
+def expect_without_traceback(expectation: str, sut: pexpect.spawn, timeout: int = 10) -> bool:
+    expectation_found = False
+    while True:
+        try:
+            sut.expect("\n", timeout=timeout)
+            line = sut.before.decode("utf-8")
+            if "Traceback (" in line:
+                raise StackTraceFoundException
+            if expectation in line:
+                expectation_found = True
+        except pexpect.exceptions.EOF:
+            break
+    return expectation_found
+
+
 if __name__ == "__main__":
     test = NamespaceAdminTest()
     test.run_test()