fix: tags argument in workspace tags block is optional (#157)

It was marked as required, which is incorrect. The provider has it as optional.

Author: Emyrk

extract/parameter.go

@@ -252,7 +252,7 @@ func optionalStringEnum[T ~string](block *terraform.Block, key string, def T, va
 		tyAttr := block.GetAttribute(key)
 		return "", &hcl.Diagnostic{
 			Severity: hcl.DiagError,
-			Summary:  fmt.Sprintf("Invalid %q attribute", key),
+			Summary:  fmt.Sprintf("Invalid %q attribute for block %s", key, block.Label()),
 			Detail:   err.Error(),
 			Subject:  &(tyAttr.HCLAttribute().Range),
 			//Context:     &(block.HCLBlock().DefRange),
@@ -275,7 +275,7 @@ func requiredString(block *terraform.Block, key string) (string, *hcl.Diagnostic
 
 		diag := &hcl.Diagnostic{
 			Severity: hcl.DiagError,
-			Summary:  fmt.Sprintf("Invalid %q attribute", key),
+			Summary:  fmt.Sprintf("Invalid %q attribute for block %s", key, block.Label()),
 			Detail:   fmt.Sprintf("Expected a string, got %q", typeName),
 			Subject:  &(tyAttr.HCLAttribute().Range),
 			//Context:     &(block.HCLBlock().DefRange),
@@ -393,7 +393,7 @@ func required(block *terraform.Block, keys ...string) hcl.Diagnostics {
 			r := block.HCLBlock().Body.MissingItemRange()
 			diags = diags.Append(&hcl.Diagnostic{
 				Severity: hcl.DiagError,
-				Summary:  fmt.Sprintf("Missing required attribute %q", key),
+				Summary:  fmt.Sprintf("Missing required attribute %q for block %q", key, block.Label()),
 				Detail:   fmt.Sprintf("The %s attribute is required", key),
 				Subject:  &r,
 				Extra:    nil,

workspacetags.go

@@ -17,18 +17,9 @@ func workspaceTags(modules terraform.Modules, files map[string]*hcl.File) (types
 	for _, mod := range modules {
 		blocks := mod.GetDatasByType("coder_workspace_tags")
 		for _, block := range blocks {
-			evCtx := block.Context().Inner()
-
 			tagsAttr := block.GetAttribute("tags")
 			if tagsAttr.IsNil() {
-				r := block.HCLBlock().Body.MissingItemRange()
-				diags = diags.Append(&hcl.Diagnostic{
-					Severity:    hcl.DiagError,
-					Summary:     "Missing required argument",
-					Detail:      `"tags" attribute is required by coder_workspace_tags blocks`,
-					Subject:     &r,
-					EvalContext: evCtx,
-				})
+				// Nil tags block is valid, just skip it.
 				continue
 			}