adjusting defaults for version input

action.yaml

@@ -16,7 +16,6 @@ inputs:
   version:
     description: "Optional, the Go version to install if no go.mod file is present"
     required: false
-    default: "."
 runs:
   using: composite
   steps:

install.sh

@@ -39,7 +39,7 @@ function fixVersion {
 
 echo "Parsing go version"
 #check install version field first
-if [[ -z $GO_INSTALL_VERSION ]]; then
+if [[ -z "$GO_INSTALL_VERSION" ]]; then
   echo "No version input found, checking go.mod files"
   # -P uses perl syntax
   DL_VERSION_RAW="$(grep "^go [0-9]+.[0-9]+" go.mod -P)"