Update action to account for null/empty strings

action.yaml

@@ -1,20 +1,20 @@
 # action.yml
-name: 'R spell check'
-description: 'Spell check R, Rmd and md files'
+name: "R spell check"
+description: "Spell check R, Rmd and md files"
 inputs:
-  dictionary:  # id of input
-    description: 'Dictionary file path'
+  dictionary: # id of input
+    description: "Dictionary file path"
     required: true
-    default: 'components/dictionary.txt'
+    default: "components/dictionary.txt"
   files:
     description: Glob of files to check
     required: false
 outputs:
   error_count:
     description: The number of spelling errors
 runs:
-  using: 'docker'
+  using: "docker"
   image: ghcr.io/alexslemonade/spellcheck:edge
   args:
-    - ${{ inputs.dictionary }}
+    - ${{ inputs.dictionary || 'components/dictionary.txt'  }}
     - ${{ inputs.files }}