Fix provider code generation when its schema has no attributes (#87)

The context import was previously missing.

Author: remilapeyre

internal/cmd/generate_provider_test.go

@@ -21,6 +21,10 @@ func TestGenerateProviderCommand(t *testing.T) {
 			irInputPath:   "testdata/custom_and_external/ir.json",
 			goldenFileDir: "testdata/custom_and_external/provider_output",
 		},
+		"provider_no_attributes": {
+			irInputPath:   "testdata/provider_no_attributes/ir.json",
+			goldenFileDir: "testdata/provider_no_attributes/provider_output",
+		},
 	}
 	for name, testCase := range testCases {
 		name, testCase := name, testCase

internal/cmd/testdata/provider_no_attributes/ir.json

@@ -0,0 +1,6 @@
+{
+  "provider": {
+    "name": "example"
+  },
+  "version": "0.1"
+}

internal/cmd/testdata/provider_no_attributes/provider_output/example_provider_gen.go

@@ -27,17 +27,17 @@ type GeneratorSchema struct {
 func (g GeneratorSchema) Imports() (string, error) {
 	imports := NewImports()
 
+	imports.Add(
+		code.Import{
+			Path: ContextImport,
+		},
+	)
+
 	for _, a := range g.Attributes {
 		if a == nil {
 			continue
 		}
 
-		imports.Add([]code.Import{
-			{
-				Path: ContextImport,
-			},
-		}...)
-
 		if _, ok := a.(Attributes); ok {
 			imports.Add([]code.Import{
 				{