added space and lock

Author: eavanvalkenburg

python/packages/core/agent_framework/_workflows/_viz.py

@@ -80,7 +80,7 @@ def export(self, format: Literal["svg", "png", "pdf", "dot"] = "svg", filename:
             import graphviz  # type: ignore
         except ImportError as e:
             raise ImportError(
-                "viz extra is required for export. Install it with: pip install graphviz>=0.20.0"
+                "viz extra is required for export. Install it with: pip install graphviz>=0.20.0 "
                 "The version needs to be at least 0.20.0. "
                 "You also need to install graphviz separately. E.g., sudo apt-get install graphviz on Debian/Ubuntu "
                 "or brew install graphviz on macOS. See https://graphviz.org/download/ for details."