IntelliJ can't find Gradle property, CLI gradle can.

Steps to reproduce:

1. Write a build.gradle file that requires a property specified in ~/.gradle/gradle.properties.
2. Run gradle test
3. Attempt to import the Gradle project in IntelliJ.

Expected:

The project successfully imports.

Observed:

    No such property: spredfastRepoUsername for class org.gradle.api.internal.artifacts.repositories.DefaultPasswordCredentials._Decorated`