Don't include ="" for attributes with empty string

src/compiler.js

@@ -70,9 +70,14 @@ module.exports = class Compiler {
     let result = `<${node.functionName.name}`
 
     node.args.filter(arg => arg.constructor.name === 'Attribute').forEach(arg => {
-      result += ` ${arg.name}=`
+      result += ` ${arg.name}`
+
       let compiler = new Compiler([arg.value], this.context)
-      result += `"${compiler.compile()}"`
+      let attrValue = compiler.compile()
+
+      if (attrValue) {
+       result += `="${attrValue}"`
+      }
     })
 
     result += '>'