BytecodeAnalysisIndex: conservatively handle cases when contract inferred only via exceptional path

Fixes IDEA-155544 Wrong inferred contract annotation for Console.readPassword()

java/java-tests/testData/codeInspection/bytecodeAnalysis/annotations/javax/swing/annotations.xml

@@ -1008,9 +1008,6 @@
         <annotation name='org.jetbrains.annotations.NotNull'/>
     </item>
     <item name='javax.swing.JTable.GenericEditor java.awt.Component getTableCellEditorComponent(javax.swing.JTable, java.lang.Object, boolean, int, int)'>
-        <annotation name='org.jetbrains.annotations.Contract'>
-            <val val="&quot;null,_,_,_,_-&gt;null&quot;"/>
-        </annotation>
         <annotation name='org.jetbrains.annotations.Nullable'/>
     </item>
     <item name='javax.swing.JTable.GenericEditor java.lang.Object getCellEditorValue()'>

java/java-tests/testData/codeInspection/bytecodeAnalysis/annotations/org/apache/velocity/util/annotations.xml

@@ -164,9 +164,6 @@
         </annotation>
     </item>
     <item name='org.apache.velocity.util.StringUtils java.lang.String stackTrace(java.lang.Throwable)'>
-        <annotation name='org.jetbrains.annotations.Contract'>
-            <val val="&quot;null-&gt;null&quot;"/>
-        </annotation>
         <annotation name='org.jetbrains.annotations.Nullable'/>
     </item>
     <item name='org.apache.velocity.util.StringUtils java.lang.String sub(java.lang.String, java.lang.String, java.lang.String)'>