NullPointerException when getting JWT validator by Issuer

[pubudu538]

Description:
SEVERE: Exception while executing runnable io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed@7a0bfdbf
java.lang.NullPointerException: Cannot invoke "org.wso2.apk.enforcer.subscription.SubscriptionDataStore.getJWTValidatorByIssuer(String, String)" because the return value of "org.wso2.apk.enforcer.subscription.SubscriptionDataHolder.getSubscriptionDataStore(String)" is null
at org.wso2.apk.enforcer.security.jwt.Oauth2Authenticator.getJwtValidationInfo(Oauth2Authenticator.java:476)
at org.wso2.apk.enforcer.security.jwt.Oauth2Authenticator.authenticate(Oauth2Authenticator.java:136)
at org.wso2.apk.enforcer.security.AuthFilter.authenticate(AuthFilter.java:175)
at org.wso2.apk.enforcer.security.AuthFilter.handleRequest(AuthFilter.java:131)
at org.wso2.apk.enforcer.api.API.executeFilterChain(API.java:42)

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[pubudu538]

Fixed with #2206