Revert "Add exception on implicit empty config (#123)" (#126)

This reverts commit 59f1454.

examples/jar-plugin/custom-trait/consumer/build.gradle.kts

@@ -14,8 +14,4 @@ repositories {
 
 dependencies {
     implementation(project(":custom-string-trait"))
-}
-
-smithy {
-    smithyBuildConfigs.set(project.files())
-}
+}

smithy-base/src/main/java/software/amazon/smithy/gradle/SmithyExtension.java

@@ -56,6 +56,7 @@ private void configureDefaults(Project project) {
         getFormat().convention(true);
         getAllowUnknownTraits().convention(false);
         getOutputDirectory().convention(getDefaultOutputDirectory(project));
+
     }
 
     /**

smithy-base/src/main/java/software/amazon/smithy/gradle/tasks/SmithyBuildTask.java

@@ -10,12 +10,10 @@
 import java.util.List;
 import java.util.stream.Collectors;
 import javax.inject.Inject;
-import org.gradle.api.GradleException;
 import org.gradle.api.file.DirectoryProperty;
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.provider.Property;
-import org.gradle.api.provider.Provider;
 import org.gradle.api.provider.SetProperty;
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.InputFiles;
@@ -59,14 +57,14 @@ public SmithyBuildTask(ObjectFactory objectFactory) {
     public abstract SetProperty<String> getProjectionSourceTags();
 
 
-    /**
-     * Smithy build configs to use for building models.
+    /** Smithy build configs to use for building models.
      *
      * @return list of smithy-build config json files
      */
     @InputFiles
     public abstract Property<FileCollection> getSmithyBuildConfigs();
 
+
     /**
      * Sets whether to fail a {@link SmithyBuildTask} if an unknown trait is encountered.
      *
@@ -106,27 +104,10 @@ List<String> getModelAbsolutePaths() {
                 .collect(Collectors.toList());
     }
 
-    /**
-     * Read-only property.
-     *
-     * @return Returns true if at least one of the specified build configs exists.
-     */
-    @Internal
-    Provider<Boolean> getSmithyBuildConfigsMissing() {
-        return getSmithyBuildConfigs().map(
-                files -> !files.isEmpty() && files.filter(File::exists).isEmpty()
-        );
-    }
-
     @TaskAction
     public void execute() {
         writeHeading("Running smithy build");
 
-        if (getSmithyBuildConfigsMissing().get()) {
-            throw new GradleException("No smithy-build configs found. "
-                    + "If this was intentional, set the `smithyBuildConfigs` property to an empty list.");
-        }
-
         BuildParameterBuilder builder = new BuildParameterBuilder();
 
         // Model discovery classpath