feature/nodeMavenApi bug

[concon121]

Remember to fix this tomorrow!

atom-maven.js:75 Uncaught (in promise) TypeError: 
pom.project.dependencies.dependency[Symbol.iterator] is not a function(…)
getClasspathFromDependencies @ atom-maven.js:75
writeClasspath @ atom-maven.js:51
(anonymous function) @ atom-maven.js:38
_tickCallback @ internal/process/next_tick.js:103

[concon121]

Happens when a pom file has no dependencies and the object pom.project.dependencies.dependency is null. Solution was to simply check if it was an instanceof Array.