Notify user when config directory can't be created because there is already a file with the same name (#1134)

* Moving configuration values and methods from install.py to config.py -- everything is broken right now
* Using context to store config path - still lots broken
* Use mocks and context.config_path to store test configs - many tests still broken though
* Update changelog [ci skip]
* Fix jrnl --ls crash
* Fix crash when no editor configured
* Attempt to patch config path with test data - doesn't appear to be working
* Properly use patched config path and add config given to scenario that wasn't using it
* Fix copypasta
* Fix editor test that needed patched config and trapping for system exit
* Add exception and handling for when configuration directory is actually a file
* Remove extraneous comment
* Use more generic JrnlError with messaging switchboard
* Format code a bit nicer
* Remove unnecessary given in diagnostic test
* Ensure full error message is output
* Remove unnecessary whitespace characters

jrnl/cli.py

@@ -7,6 +7,7 @@ import sys
 
 from .jrnl import run
 from .args import parse_args
+from .exception import JrnlError
 
 
 def configure_logger(debug=False):
@@ -33,5 +34,9 @@ def cli(manual_args=None):
 
         return run(args)
 
+    except JrnlError as e:
+        print(e.message, file=sys.stderr)
+        return 1
+
     except KeyboardInterrupt:
         return 1