allow empty package (#226)

Author: patricklx

src/main/kotlin/com/emberjs/hbs/linter/ember-template-lint/TemplateLintConfiguration.kt

@@ -15,12 +15,10 @@ class TemplateLintConfiguration(project: Project) : JSLinterConfiguration<Templa
 
     override fun loadPrivateSettings(state: TemplateLintState): TemplateLintState {
         this.myPackage.readOrDetect()
-        val constantPackage = myPackage.getPackage().constantPackage
-                ?: throw AssertionError("TemplateLint does not support non-constant node package refs")
 
         return state.copy(
                 myInterpreterRef = this.myPackage.interpreter,
-                myTemplateLintPackage = constantPackage
+                myTemplateLintPackage = this.myPackage.getPackage().constantPackage
         )
     }
 

src/main/kotlin/com/emberjs/hbs/linter/ember-template-lint/TemplateLintState.kt

@@ -6,11 +6,11 @@ import com.intellij.lang.javascript.linter.JSNpmLinterState
 
 data class TemplateLintState(
         private val myInterpreterRef: NodeJsInterpreterRef,
-        private val myTemplateLintPackage: NodePackage,
+        private val myTemplateLintPackage: NodePackage?,
         val isRunOnSave: Boolean,
 ) : JSNpmLinterState<TemplateLintState> {
 
-    private val myPackageRef: NodePackageRef = NodePackageRef.create(myTemplateLintPackage)
+    private val myPackageRef: NodePackageRef? = myTemplateLintPackage?.let { NodePackageRef.create(it) }
 
     override fun withLinterPackage(packageRef: NodePackageRef): TemplateLintState {
         val constantPackage = packageRef.constantPackage
@@ -24,12 +24,12 @@ data class TemplateLintState(
     }
 
     override fun getNodePackageRef(): NodePackageRef {
-        return this.myPackageRef
+        return this.myPackageRef!!
     }
 
     val templateLintPackage: NodePackage
         get() {
-            return this.myTemplateLintPackage
+            return this.myTemplateLintPackage!!
         }
 
     companion object {