[FIX] missing initialisation added

include/seqan3/search/fm_index/bi_fm_index_cursor.hpp

@@ -119,9 +119,9 @@ class bi_fm_index_cursor
     // need to store it twice. Once the cursor is switched, the information becomes invalid anyway.
 
     //!\brief Left suffix array interval of the parent node.
-    size_type parent_lb;
+    size_type parent_lb{};
     //!\brief Left suffix array interval of the parent node.
-    size_type parent_rb;
+    size_type parent_rb{};
     //!\brief Label of the last edge moved down. Needed for cycle_back() or cycle_front().
     sdsl_char_type _last_char;
     //\}

include/seqan3/search/fm_index/fm_index_cursor.hpp

@@ -87,15 +87,15 @@ class fm_index_cursor
     //!\}
 
     //!\brief Underlying FM index.
-    index_type const * index;
+    index_type const * index{nullptr};
     //!\brief Left suffix array interval of the parent node. Needed for cycle_back().
-    size_type parent_lb;
+    size_type parent_lb{};
     //!\brief Right suffix array interval of the parent node. Needed for cycle_back().
-    size_type parent_rb;
+    size_type parent_rb{};
     //!\brief Underlying index from the SDSL.
-    node_type node;
+    node_type node{};
     //!\brief Alphabet size of the index without delimiters
-    sdsl_sigma_type sigma;
+    sdsl_sigma_type sigma{};
 
     template <typename _index_t>
     friend class bi_fm_index_cursor;