remove logic table check for TableRule, check should at config package

sharding-core/src/main/java/org/apache/shardingsphere/core/rule/TableRule.java

@@ -17,7 +17,6 @@
 
 package org.apache.shardingsphere.core.rule;
 
-import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import lombok.AccessLevel;
 import lombok.Getter;
@@ -94,7 +93,6 @@ public final class TableRule {
     }
     
     public TableRule(final TableRuleConfiguration tableRuleConfig, final ShardingDataSourceNames shardingDataSourceNames, final String defaultGenerateKeyColumn) {
-        Preconditions.checkNotNull(tableRuleConfig.getLogicTable(), "Logic table cannot be null.");
         logicTable = tableRuleConfig.getLogicTable().toLowerCase();
         List<String> dataNodes = new InlineExpressionParser(tableRuleConfig.getActualDataNodes()).splitAndEvaluate();
         dataNodeIndexMap = new HashMap<>(dataNodes.size(), 1);