Fuzzing throws exception in Contest Estimator

[Domonion]

Description

There are hundreds of error messages in the UTBot log from Contest Estimator. Looks like the problem is in the fuzz.

To Reproduce

Steps to reproduce the behavior:

1. Run the 'spoon-core-7.0.0' project in Contest Estimator
2. Open logs/utbot.log

Expected behavior

Clean log

Actual behavior

A lot of following exceptions:

java.lang.IllegalStateException: No seed candidates generated for type: FuzzedType(classId=spoon.reflect.cu.CompilationUnit, generics=[])
	at org.utbot.fuzzing.FuzzingApi.produce(Api.kt:350) ~[main/:?]
	at org.utbot.fuzzing.FuzzingApi.fuzz(Api.kt:323) ~[main/:?]
	at org.utbot.fuzzing.FuzzingApi.fuzz$fuzzOne(Api.kt:250) ~[main/:?]
	at org.utbot.fuzzing.FuzzingApi.access$fuzz$fuzzOne(Api.kt:1) ~[main/:?]
	at org.utbot.fuzzing.FuzzingApi$fuzz$2$1.invokeSuspend(Api.kt:267) ~[main/:?]
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) ~[kotlin-stdlib-1.7.20.jar:1.7.20-release-201(1.7.20)]
	at kotlin.sequences.SequenceBuilderIterator.hasNext(SequenceBuilder.kt:129) ~[kotlin-stdlib-1.7.20.jar:1.7.20-release-201(1.7.20)]
	at org.utbot.fuzzing.FuzzingApi.fuzz(Api.kt:660) ~[main/:?]
	at org.utbot.fuzzing.ProvidersKt.runFuzzing(Providers.kt:18) ~[main/:?]
	at org.utbot.fuzzing.ProvidersKt.runFuzzing$default(Providers.kt:11) ~[main/:?]
	at org.utbot.fuzzing.JavaLanguageKt.runJavaFuzzing(JavaLanguage.kt:114) [main/:?]
	at org.utbot.engine.UtBotSymbolicEngine$fuzzing$2.invokeSuspend(UtBotSymbolicEngine.kt:348) [main/:?]
	at org.utbot.engine.UtBotSymbolicEngine$fuzzing$2.invoke(UtBotSymbolicEngine.kt) [main/:?]
	at org.utbot.engine.UtBotSymbolicEngine$fuzzing$2.invoke(UtBotSymbolicEngine.kt) [main/:?]
	at kotlinx.coroutines.flow.SafeFlow.collectSafely(Builders.kt:61) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.AbstractFlow.collect(Flow.kt:230) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt__CollectKt.emitAll(Collect.kt:109) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt.emitAll(Unknown Source) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt__MergeKt$flattenConcat$1$1.emit(Merge.kt:80) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt__MergeKt$flattenConcat$1$1.emit(Merge.kt:80) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt__BuildersKt$flowOf$$inlined$unsafeFlow$1.collect(SafeCollector.common.kt:114) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at kotlinx.coroutines.flow.FlowKt__MergeKt$flattenConcat$$inlined$unsafeFlow$1.collect(SafeCollector.common.kt:113) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at org.utbot.contest.ContestKt$runGeneration$1$5$engineJob$1$job$1.invokeSuspend(Contest.kt:325) [main/:?]
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) [kotlin-stdlib-1.7.20.jar:1.7.20-release-201(1.7.20)]
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106) [kotlinx-coroutines-core-jvm-1.6.3.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_352]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_352]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_352]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_352]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_352]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_352]
	at java.lang.Thread.run(Thread.java:750) [?:1.8.0_352]