Handle NPE during network requests

app/src/main/kotlin/org/koitharu/kotatsu/core/network/GZipInterceptor.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.core.network
 
 import okhttp3.Interceptor
 import okhttp3.Response
+import okio.IOException
 import org.koitharu.kotatsu.core.network.CommonHeaders.CONTENT_ENCODING
 
 class GZipInterceptor : Interceptor {
@@ -9,6 +10,10 @@ class GZipInterceptor : Interceptor {
 	override fun intercept(chain: Interceptor.Chain): Response {
 		val newRequest = chain.request().newBuilder()
 		newRequest.addHeader(CONTENT_ENCODING, "gzip")
-		return chain.proceed(newRequest.build())
+		return try {
+			chain.proceed(newRequest.build())
+		} catch (e: NullPointerException) {
+			throw IOException(e)
+		}
 	}
 }