Using with AndroidX

ReActiveAndroid Version: Latest

Bug or Feature Request: Bug

Description: Issue with ReActiveAndroid compatibility with AndroidX or SDK Version

AndroidX compileSdkVersion 28 minSdkVersion 21 targetSdkVersion 28

implementation 'androidx.appcompat:appcompat:1.0.2' implementation 'com.google.android.material:material:1.0.0' implementation 'androidx.constraintlayout:constraintlayout:1.1.3' implementation 'androidx.vectordrawable:vectordrawable:1.0.1' implementation 'androidx.legacy:legacy-support-v4:1.0.0' implementation 'androidx.recyclerview:recyclerview:1.0.0'

error when save() error when select()

Attempt to invoke interface method 'java.lang.Object java.util.Map.get(java.lang.Object)' on a null object reference

at com.reactiveandroid.ReActiveAndroid.getDatabaseForTable(ReActiveAndroid.java:118)
        at com.reactiveandroid.ReActiveAndroid.getTableName(ReActiveAndroid.java:186)
        at com.reactiveandroid.query.Select$From.getPartSql(Select.java:181)
        at com.reactiveandroid.query.QueryBase.getSql(QueryBase.java:19)
        at com.reactiveandroid.query.AggregateQueryBase.getAggregateFunctionSql(AggregateQueryBase.java:112)
        at com.reactiveandroid.query.AggregateQueryBase.count(AggregateQueryBase.java:21)