Add more context to CLI error messages (#531)

* feat: add more text to CLI error messages

* chore: update changelog

Author: gadomski

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Support for fetching catalog queryables [#477](https://github.com/stac-utils/pystac-client/pull/477)
 - PySTAC Client specific warnings [#480](https://github.com/stac-utils/pystac-client/pull/480)
 - Support for fetching and merging a selection of queryables [#511](https://github.com/stac-utils/pystac-client/pull/511)
+- Better error messages for the CLI [#531](https://github.com/stac-utils/pystac-client/pull/531)
 
 ### Changed
 

pystac_client/cli.py

@@ -7,6 +7,8 @@
 import warnings
 from typing import Any, Dict, List, Optional
 
+from pystac import STACTypeError
+
 from .client import Client
 from .conformance import ConformanceClasses
 from .item_search import OPS
@@ -50,7 +52,7 @@ def search(
         return 0
 
     except Exception as e:
-        print(e)
+        print(f"ERROR: {e}")
         return 1
 
 
@@ -64,8 +66,15 @@ def collections(client: Client, save: Optional[str] = None) -> int:
         else:
             print(json.dumps(collections_dicts))
         return 0
+    except STACTypeError as e:
+        print(f"ERROR: {e}")
+        print(
+            f"The client at {client.self_href} is OK, but one or more of the "
+            "collections is invalid."
+        )
+        return 1
     except Exception as e:
-        print(e)
+        print(f"ERROR: {e}")
         return 1
 
 
@@ -329,7 +338,7 @@ def cli() -> int:
         )
 
     except Exception as e:
-        print(e, file=sys.stderr)
+        print(f"ERROR: {e}", file=sys.stderr)
         return 1
 
     if cmd == "search":