Merge pull request #980 from hashicorp/fix-workspace-interface-conv-panic

Fix workspace interface conv panic

Author: sebasslash

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## Unreleased
 
+BUG FIXES:
+* `r/tfe_workspace`: Fix panic when updating `trigger_patterns` attribute, by @liamstevens [969](https://github.com/hashicorp/terraform-provider-tfe/pull/969)
+
 FEATURES:
 * **New Resource**: `r/tfe_saml_settings` manages SAML Settings, by @karvounis-form3 [970](https://github.com/hashicorp/terraform-provider-tfe/pull/970)
 * `d/tfe_saml_settings`: Add PrivateKey (sensitive), SignatureSigningMethod, and SignatureDigestMethod attributes, by @karvounis-form3 [970](https://github.com/hashicorp/terraform-provider-tfe/pull/970)

tfe/resource_tfe_workspace.go

@@ -603,7 +603,9 @@ func resourceTFEWorkspaceUpdate(d *schema.ResourceData, meta interface{}) error
 
 		if tps, ok := d.GetOk("trigger_patterns"); ok {
 			for _, tp := range tps.([]interface{}) {
-				options.TriggerPatterns = append(options.TriggerPatterns, tp.(string))
+				if val, ok := tp.(string); ok {
+					options.TriggerPatterns = append(options.TriggerPatterns, val)
+				}
 			}
 		} else {
 			options.TriggerPatterns = []string{}